The only reasoning I see behind Kat's inclusion is the fact she is on the Vita. Gravity Rush is not a franchise, nor is it that popular outside internet circles. Wander is big because of its cult following (again, among artsy, internet followings). Gran Turismo is the oddest thing NOT to have included in the game. That I can agree with. The best selling PS franchise does not even have an item. I do not expect a character, but maybe a stage mash-up.
Welcoming Committee- "The business of gaming is business"
This game needs more female fighters. I agree with Kat being DLC, but also, since Paul Gale said they were thinking of having a Street Fighter Rep, I think Chun-Li, C.Viper, or Juri should be one of the reps over Ryu. The Gran Tourismo stage would be a cool crossover with ModNation Racers.