Not sure if this is the right place to post this but I've just covered a rumor circulating on both the internet & Neo Gaf at the moment regarding a new PaRappa the Rapper title coming out for PS4 from Media Molecule & Queasy Games. I will include the article I just typed up below. Quick heads up, Everything in my article is everything I currently know on this rumor and I just wanted to share it with you guys.
I know I shouldn't say this, but I actually give this rumor some credibility, especially the part where they said it'll most likely use tech from Tearaway, that'd actually be pretty clever, seeing as both games have to do with paper. Also, it'd be cool if the game actually had HD Anime Cutscenes, just like the actual Parappa Anime. Only thing is that apparently, Rhythm Games nowadays have a hard time syncing (As in they lag, ALOT) with the button presses when using HD TV'S, try playing Parappa 1 on an HD TV, it's a nightmare.
If this actually happens, hopefully this meant that All-Stars was meant to bring back old franchises. As in MediEvil and Ape Escape will probably have comebacks as well. Maybe this could even help Sony make an All-Stars sequel! (I'm digging into this WAY too much, but hey, I GOTTA BELIEVE!)