I dunno. I just remember some commercials about switching from PS3 or 4 (I don't remember which) to the vita to continue playing on the go. Then nobody really talked about it. If it worked well, I could see it being a really awesome feature. Even if it only worked for older games.
There are games like that. Ones that are "cross-save". You have to use cloud saves to take advantage of it. The only games I've really ever seen use it are indie games (because they tend to be cross-buy as well) and Final Fantasy X HD (for some reason). I think Borderlands 2 does it. I think part of the reason why no one talks about it is because the Vita doesn't have a great selection of games. If you don't like Indie or JRPGs you really don't have anything. But if you do like both those things it's probably the best platform for them both (although the indie part can be argued because of the PC).
Today I played a lot of Super Mario 3D World. It's so damn good.