I'll answer that too.
E3 won't have any japanese games of notice for vita, except if there's an exclusive Metal Gear or Final Fantasy, which is doubtful, but may happen. MH won't be announced at E3, no chance.
Now for what I hope to happen:
Big support from Capcom - 3 games at least. Resi Rev will be ported.
Big support from Konami - MGS is way more important, but Castlevania would hurt 3DS's users egos a lot







