I made a list of E3 predictions, i'll copy-paste the nintendo ones.
This time we'll get a proper conference which hypes the core gamers the most. 3DS is doing fine as always but it's starting to lack games, WiiU on the contrary must need some heavy 1st party/3rd party co-developed titles to stay alive. Maybe Direct to show games's demoes for those unable to be at their booth.
3DS
Price drop for both Lite and XL
New "Elite" revision for 2015 ---> (XL with two analogs, 4gb internal memory, screen resolution doubled, spring 2015)
Zelda Majora's Mask 3d ---> (so teased it's inevitable, XL special edition)
Pokémon Z ---> (usual 3rd PKMN game with improvements and new pokémon, just wonder who's gonna be on the cover since Zygarde isn't a surprise)
Smash Bros ---> (new trailer with final release date, Chrom 3ds exclusive character)
Bravely Second ---> (JP release Late 2014, first half of 2015 for the west)
Dragon Quest VII ---> (release in Fall)
Yokai Watch 1 ---> (together with anime airing announcement)
Monolith Soft 3DS game ---> (we know they've been working on it for a while, more at tgs, most surely 2015)
Metroid ---> (2d game prequel to Wii U's one)
WII U
New firmware update
Smash Bros ---> (release date announced, Shulk WiiU exclusive character)
Bayonetta 2 ---> (live demo, release date announced)
Zelda U ---> (at long last, it's every zelda hardcore fan wet dream, visual style appealing to the masses, great graphics, Spring 2015)
Metroid ---> (hardcore reboot made by Retro, 2d prequel on 3ds, 2015)
Star Fox ---> (just a teaser, made by platinum W101 team, 2015)
x ---> (full name revealed, proves itself as more than a Monster Hunter clone with proper single player storyline, Jap release date and West season)
Something by EAD ---> (title to appeal kids and families)
New Miyamoto IP ---> (a title to cater every type of gamer)
Watch_Dogs UBERDOWNGRADE EDITION ---> (watch it being even worse than PS360 with dlc timed exclusive and silly gamepad features)
Monster Hunter Online ---> (brand new title with MMORPG features, buy2play, uses some Panty Raid engine techs but very badly)
Hyrule Warriors ---> (playable demo, fall 2014)
Pokkén ---> (just a tech demo, developed by ???, no hints of release)
Yarn Yoshi ---> (2014 title)