Of course Plants vs. Zombies was coming to the PS Vita. Considering PopCap's penchant to port their games to every platform imaginable, the addictive game developer needed to have a game ready for the Vita launch in February.
Plants vs Zombies will be distributed via PlayStation Network for Vita, and apparently it looks just like the SOE-ported version for PlayStation 3.
Of course, unlike the PS3 version, PvZ will feature touch screen controls in addition to the standard button controls. There's also Vita-specific online leaderboards. Otherwise, IGN reports that you're getting "more of the same," adding "not that there's anything wrong with that."
Given the straightforward nature of this port, it's unsurprising that other Vita features aren't being taken advantage of. It appears that there's no cross-compatibility between the PS3 and Vita versions: no transfarring, no cloud saves, and sadly, no single purchase for both versions. The Vita version may offer one bonus, however: a Platinum trophy, which the original PS3 version lacked.