So PS Vita is definitely living for 2015,atleast in Japan.
Only game confirmed for Vita in the west in 2015 is Mighty No.9 atm :P.
Sign this petition please if you want GTA san andreas on PS Vita:
http://www.change.org/petitions/rockstar-games-port-grand-theft-auto-san-andreas-to-the-playstation-vita
And please spread it to various sites/forums etc.
Upcoming notable indies for PS Vita: