NO!!! While I think that would be a fun game, it's not what the Vita needs. Reviewers and the like already bash Vita games for having different names and different developers, imagine what they would do if you didn't even play as the main character? In a few years when Vita is doing good a Demios spin off would be great. Right now we need a traditional GOW that sticks with its roots.

Games I expect:

GTA, Grand Turismo Vita, either Uncharted Vita 2 or Jak and Daxter Vita, Final Fantasy Type 0, Puppeteer cross buy....

Games I want to be announced:

All of the above, Left for Dead Vita, Portal Vita, Morrowind HD remake, Digimon reboot (developed by sony of Japan!!), Mindcraft port, Borderlands spinoff, Okami 2, Knights of the old republic HD collection.

I certainly would like to see a reboot of Crash Bandicoot by Naughty Dog. Don't know if that's even possible, though.

Ideally...the vita should have it's own god of war series...with a different main character.

Persona 5 :P

Hopefully Bioshock will be officially shown/re-confirmed

I'd love to see grand theft auto on the vita, if that game were to be announced then i'll finally get one, even though i'm pro 3ds :)

GTA from Rockstar Leeds (they were rumored to be working on one since 2011)
A game from bend
Another Assassins Creed (liberation sold really well)
COD
GT (Maybe)

Ys
And so on. Thats a lot of exclusives on top of already announced ones. A price cut coupled with this can be the perfect vita receipe.

Final fantasy type 0 is a must, And Im thinking a gran turismo maybe announced aswell