I'm expecting more from third parties than Nintendo for this direct.
Possible new third party announcements:
South Park: Fractured But Whole+Stick of Truth
This has been rumored for awhile since this
tweet last year, and then a
retailer listing popping up for a Switch version and because the Snowdrop engine was ported to the Switch from Mario+Rabbids. Seems like a reasonable port to expect.
Diablo 3
Even though Eurogamer confirmed the rumors, that same source said this wasn't suppose to be announced for awhile so who knows if it'll be shown in this direct. Maybe they'll just announce it earlier since it's been leaked, but I'm leaning towards an E3 announcement.
Call of Duty
CoD has been rumored and been on every Nintendo system since the Wii so this guaranteed to be announced at some point in time.
Assassin's Creed
Ubisoft and Nintendo seem like they have a good relationship so I wouldn't be surprised about this. Not sure if there's been any actual rumors, but the official Assassin's Creed twitter account did retweet a pic during those series of retweets of the Chibi-robo on fire from NoA.
Crash Bandicoot N. Sane Trilogy
Possibly leaked.
League of Legends
I have never played this game and know almost nothing about it or how well it would work on Switch and don't really have much reason to believe it will come to Switch but Riot Games were also part of the series of chibi-robo on fire retweets so just throwing this out there.
Dragon Ball Fighter Z
XV2 exceeded expectations. Bound to happen. Thinking they'll wait until after blazblu cross tag battle releases though.
GTA V
Maybe some feel this is too big of a thing to announce in an earlier direct and not E3, but Nintendo has had some big announcements in non-E3 directs before so it's possible.
SaGa Scarlet Graces
Ok so there's no basis for this one other than personal desire. Please don't leave this to die on the Vita.
Known third party games
Project Octopath Traveler
Probably a new trailer+release date. Maybe show off some more unique traits of the other characters not playable in the demo. Also, a new title? The current title was a “working title” but I'm actually okay with the title as is.
Travis Strikes Again: No More Heroes
Originally slated for EARLY 2018 ,they must have some gameplay to show by now. I don't think it'll be quite what people expect though considering people thought this would be NMH3. Everything points to it being on a much smaller scale.
SMT V
My most anticipated Switch title, but I don't see it happening. In a recent
famitsu interview, the producer said to not expect any news from this game for some time.
Wolfenstein II
Release date before E3 would probably be a good idea since there aren't any major releases to compete with.
Dragon Quest XI
I remember the devs had some technical hurdles possibly due to using a different version of UE4(PS4 version built on UE4.13, Switch on UE4.15), but hopefully they've been making good progress on the Switch version and aiming for a simultaneous western release with the PS4 version. Announcement of Switch release in the direct, followed by a SE PR statement for the PS4 version after.
“Tales of” Port
On Namco Bandai's
FY 2017 report, they listed a Tales of game being released on the Switch before the next FY(begins April 1st,2018). Not sure if it's going to make it with such a short window for release now but everything points to a port of some kind anyway so an announcement is at least likely.
New Story of Seasons
I think this was announced before the Switch was even released but we still haven't seen anything from it yet. The more recent trend on the 3DS games has been 2 years between each new release. The last SoS game was released in 2016.
Bayonetta 3
Think it's too soon for a trailer or another teaser.
Nintendo
Super Mario Odyssey new content/DLC
From the recent datamine, we know there are at least 12 more costumes to unlock in the game. I'm thinking they are either a part of new DLC or new free modes like Balloon World. Boos are strangely absent from the game and there have been recent rumors of a Luigi's Mansion Kingdom DLC. Don't know how credible the source of those rumors are, but it seems something that would make a lot of sense. Isle Delfino DLC is another possibility since bloopers are noticeably absent and we have a Mario Sunshine costume already.
Mario Tennis Aces
“Spring 2018”, but there was a recent
Amazon Spain listing that dated it for June 22, which would actually make it a post-E3 release. Possibly delaying it to give more opportunity for bigger third party games? Should show up in the direct regardless. I felt slightly better from this initial trailer than I did Mario Tennis Ultra which looked bare bones from the start. Just hoping for a decent amount of content+solid mechanics.
Fire Emblem
A teaser with a new subtitle showing off the main characters/world. No release date.
Pokken Tournament DX DLC
Still need to show off Blastoise I guess.
Pokemon
Nope.
Metroid Prime 4
Haha no.
More Wii U Ports!
-I think XCX will eventually happen but won't be announced during this direct. Hasn't been that long since XC2.
-if this direct IS about their online, then I could see Smash Bros DX being announced. Otherwise, not yet.
-I was thinking about that new “8-bit cap” costume datamined from Mario Odyssey. I could see Nintendo tying in the release of the costume somehow with the release of a Mario Maker port.
Nintendo's Online Service
They recently updated mynintendo so you'll earn more gold coins and can spend those coins in the eshop but for some reason removed the “Switch rewards coming soon” from the mynintendo page. I'm assuming they're tying in Switch rewards with their online service somehow because mynintendo is kind of shit right now for Switch owners. I'm thinking Nintendo will allow you to win Switch rewards on mynintendo by playing games through their online service.
3DS Stuff
-Localizations for some of these: DQXI, Jokers 3, Etrian Mystery Dungeon 2, Yokai Watch 3
-trailer for that new Etrian Odyssey game
-some smaller scale Nintendo game similar to those Kirby spinoffs or Hey Pikmin