Nintendo:
-The Switch does really well initially. Not Wii great, but trends well ahead of the Wii U.
-The objective with Switch isn't just to beat the previous console's sales, though, it's to beat console and handheld sales combined. Over time it will be clear that it's not capturing the handheld market like previous Nintendo handhelds have, which will be a problem considering that they'll be developing historically handheld-weighted franchises with console budgets and prices. These sorts of titles still sell okay, but not enough to justify the huge jump in development cost. Mid 2018 sees Nintendo release a Switch Mini to combat the problem, Switch hardware with a more handheld size and no modular components. This does pretty well to rectify the situation.
-Hardcore fans will be a bit nonplussed at the amount of enhanced Wii U ports in the Switch's first year, but they will be a boon to the system's perception. They'll pad out the release schedule nicely to prevent droughts, and a significant portion of people buying the Switch won't have played those games originally. Plus, despite their grumbling, plenty of Nintendo marks will line up to rebuy them anyway.
-Breath of the Wild will have a great overworld, but very disappointing dungeons with a lack of Zelda's usual structured design. The non-linear nature that you can visit them in will, much like Link Between Worlds, mean each dungeon will only focus around the use of one item to the exclusion of the rest of your inventory.
-3DS still enjoys strong sales, despite Nintendo trying to abandon it and move those sales to the Switch.
-NES Classic Mini shipments overcorrect and are abundant on store shelves around February. They sell at a decent clip, though, and are hard to find again a few months later.
-Switch announcements: 3D Mario, Kirby, Fire Emblem, Animal Crossing, Nintendoland 2, Pikmin 4
-Switch enhanced ports: Splatoon, Mario Kart 8, Super Smash Bros., Hyrule Warriors, Pokemon Sun & Moon
Sony:
-Horizon is a visual dynamo but the game part will be kinda middle-of-the-road. The writing is weak and the gameplay is kinda eh and repetitive.
-Days Gone, Detroit, and the Crash collection will be Sony's Q4 slate. Days Gone will surprise people with its quality, but it'll only perform okay at retail, the market's kind of fatigued with zombies. Detroit will sharply underperform, it'll be a decent enough game, but the market hasn't responded too well to these interactive movies and this one won't turn that around. Crash Remastered will stick to the old games' gameplay a bit too faithfully and the old animation framework will seem a bit too canned and undynamic against the newer visuals, but it'll sell solid numbers during the holidays due to it being the most visible reply to "what's a good PS4 game for kids?"
-Uncharted: The Lost Legacy w/ UC4's multiplayer and all its expansions will release as a $40-50 standalone disc during the summer. GT Sport releases in the same timeframe, and is plagued by server hiccups and some iffy performance on non-Pro PS4s.
-God of War will be Spring 2018, Spider-man Summer 2018, and TLOU2 Winter 2018. Death Stranding is a moving goalpost for a couple years and will probably be shifted to PS5.
-FFVII Remake's first episode just squeaks in at the end of the year, and is overly short with a lot of fiercely hated gameplay changes and narrative cuts.
-PS4 Pro and PSVR exist quietly and without much fanfare.
-Bloodborne 2 and a Sucker Punch third-person shooter are the big E3 announcements.
Microsoft:
-Scorpio is delayed to 2018 and now billed as a legit successor console. MS looks at PS4 Pro sales and concludes the whole "it's like a new system, but it's not" tiered upgrade approach just creates an unnecessary quagmire of consumer confusion and apathy, and they decide they don't need to rush into VR given its tepid uptake.
-Scalebound falls well below Kamiya's usual standards, but it has its fans. MS doesn't give it much of a push, sells like garbage.
-Sea of Thieves is good, but never really builds a decent player base and dies off pretty quickly.
-Halo 6 revealed at E3, presentation ends with "and we're launching this holiday," cue applause.
-Forza 7 is revealed as a Scorpio title. Crackdown 3 is rerevealed looking a lot more impressive, Scorpio launch title. Quick Gears 5 tease with a Scorpio stinger.
General:
-Persona 5 sells gangbusters. Nier Automata sells better than expected. Ni-Oh disappoints, both game-wise and sales-wise.
-Activision throws heavy marketing muscle behind Destiny 2 and backs off from of Call of Duty a bit. Sales follow suit, Destiny becomes their juggernaut while COD continues to slump.
-RDR2 slips into 2018.
-New Overwatch heroes come at a pretty glacial pace, and a big rebalance update packaged with one causes an uproar until it's walked back. The game's player base declines noticeably.
-Battleborn goes F2P and does surprisingly well.
-MvC Infinite will be hot garbage and the Marvel roster will reek of being a glorified advertisement for whatever the MCU is currently pushing.
-Street Fighter V stumbles along through S2's new characters with a few good additions and a few resounding thuds. S3 goes back to all legacy characters.
-Yooka-Laylee does great all around.
-Star Wars Battlefront II gets a single-player campaign of typical middling DICE quality, but it helps the game's sales a lot.
-Mass Effect: Andromeda scores well and leaves a good first impression but is regarded as disappointing overall.
-VR bobbles along, some new concepts pop up here and there, but nothing that inspires any mass-market uptake. Lots of VR projects are quietly cancelled or rushed out half-baked.
New game reveals:
2K: New Midnight Club, Borderlands The Third, Mafia episodic series/DLC, brief Bioshock teaser
Square-Enix: New Tomb Raider, Hitman Season 2, Theatrhythm Switch (w/ S-E and Nintendo songs), some Final Fantasy spinoff bullshit
Capcom: DMC5, downloadable Megaman X (probably just a conversion of Maverick Hunter X, but maybe an outsourced thing like Strider)
ZeniMax: Dishonored 2 DLC, New Wolfenstein, New Tango Project, brief Elder Scrolls 6 teaser
Konami: lel
EA: Star Wars Action Game, Need for Speed: Whatever the Fuck, Battlefield: Bad Company 1&2 Remastered, Mass Effect Trilogy PS4/XBO
Ubisoft: FarCry 5, New Assassin's Creed, Beyond Good & Evil Switch, Rabbids/Mario RPG What Is This Even, New Call of Juarez to piggyback on RDR2's hype
Telltale: Star Wars episodic series in collaboration with EA on a New Goddamn Engine Finally
WB Games: Damian Wayne Batman game, Dying Light 2, Lego Avengers 2, Lego Fantastic Beasts, Shadow of Mordor 2
Tecmo-Koei: DOA6, Jojo Warriors
Bandai-Namco: Soul Calibur VI, Tales of Chlamydia, a One-Punch Man game, Dragonball Super
SEGA: More Sonic and Yakuza, I reckon. Surprise Outrun?