According to a recently revealed list of XBLA Achievements found over at Xbox360Achievements, it seems that the upcoming XBLA iteration of PopCap's zombie gardening game Plants vs. Zombies will be getting a new versus mode, as well as the inclusion (in some form) of co-op play. Two separate Cheevos indicate as much -- the first named "Versus vs. Versus" (fittingly enough) and the second named "ZFF's 4 Evr" (earned by bowling "a winner with a friend in Co-Op Wall-Nut Bowling").
The real question is, of course, whether or not everyone's favorite crazy gardener be a playable character -- we can only dream, folks.
Update: A recent press release from PopCap confirms it: Plants vs. Zombies will have a Co-op mode, as well as a Vs. mode. Ed Allard, PopCap's head of worldwide studios, says, "The two new multiplayer modes allow gamers to work cooperatively to defeat hordes of invading zombies, or go head-to-head in a true 'plants vs. zombies' challenge." For more on the Xbox 360 version, check out our announcement post here.