It has been obvious for quite some time now, and this year's E3 reinforced it: there's no new major games from Sony for the PS Vita.
And according to SCE Worldwide Studios President Shuhei Yoshida, we shouldn't be expecting anything either. Instead he says:
"To be honest, I wouldn't say we will have big Triple-A Vita games from first party."
Instead he says that Sony has shifted development from the PS Vita to Playstation 4, and it's mostly indies and third party we can look forward to.