This isn't E3 news, it's just something I'm happy to learn. I was poking around at lists of upcoming Vita games and someone had listed Mercenary Kings, which is a game that really feels like it belongs on the handheld.
"I'm still bothered this isn't coming to Vita. Perhaps, a'la Galak-Z, if I mention that enough my thoughts will manifest in reality again."
-me, back in March-
Turns out it was announced a month later, but nobody really talked about it - the only confirmation I could find was this old Destructoid post from April. Still - good to know!