The Vita really isn't meant to be portable, IMO. You sound like the most important thing to you in a console is games, but you are really missing out if you reject one of the treasure-troves of amazing Japanese games just because it's a handheld.

Xbox One- Already Own
PS4- Already Own
Wii U- Metroid game.

Wii U - Already have, hopefully some footage of Zelda, Fatal Frame, and the story of Monolith Soft X.

XBone - My little brother has one, so I'll just visit and play his. Looking forward to seeing more of GOW, Halo, and Quantum Break.

PS4 - Not interested in.

I know I am already getting an Xbox One or PS4 for Arkham Knight alone... But that will be a while yet when the prices go down.

Wii U - Already own one.
PS4 - Forbidden Siren 4, Last Guardian, some Catherine-like game. Ugh, looks like I never buy it, lol.
X One - Not interesting.

Wii U = Price drop to 199.99, Zelda Wii U with gameplay innovatition and more stealth but well paced gameplay + killer soundtrack and i want quality/professional voice actors/actresses with a story that moves me. No more of this reading everydamn line to myself 1986 drama. FUN PUZZLES+FUN WEAPONARY. Get with the times Nintendo! 2D Metroid with amazing atmosphere and graphics but most gameplay could be retro. Do something innovative with the 2D platforming of the Metroid series. Why not a mission/story/plot with multiple characters this time and a more dramatic story perhaps, maybe co-op, freshin it up! A Strategy RPG that redefines and reboots the genre, so I'm lookin at you FireEmblem.

XBOXONE = Non restricted DLNA services, An exclusive RPG that could compete with and exceed the likes of Ni No Kuni, a Forza that can outdo GT and with the hardware they chose this go around it won't happen on the graphics front, so now it has to be content+physics+tracks+sound+cars. 1080p games instead of 720/900p of the ones I can buy for PS4...that won't happen either. I guess the XBOX1 really isn't MADE for me. make a Ryse 2 that is more epic than God Of Wars. Hell they need Half Life 3 exclusivity to get me to buy it the more I think about it.

PS4 = Just give me more games to buy for it because I KNOW they'll be high quality.

Xbox One: Currently nothing Microsoft does will make me consider an Xbox One. I have zero trust in them as a company with my privacy, or not to do another U-turn on their always online etc policy.
Nintendo: Already a proud and happy Wii U owner
Sony: I already intend to get a PS4 at some point, probably this year (finances allowing), so I guess it comes down to the when. If Sony shows off something epic releasing before Evolve or Dragon Age 3 comes out then I may pick one up earlier.

PS4: Uncharted 4 and New Crash Bandicoot
XO: Price cut and Gears 4

Wii U: bought

PS4: Already own. If i didn't project Morpheus could probably pursuede me to buy one.

Xbox One: Not interested in. It probably won't get many exclusives after about two years and alot will be playable on PC.

Wii-U: A price cut and a few new IP's that actually use the tablet controller.

PS4 - Include PSNow with every PS+ sub and Uncharted.

Xbox One - $350, Gears trailer and some Halo gameplay.