Most of the Vita games that have been announced thus far are going to be both retail and download. But not Malicious! Dengeki PlayStation, which reveals the Vita version of Malicious this week, lists the game as a download exclusive. Of course, this isn't too surprising given that the PlayStation 3 Malicious game was also a PSN download exclusive.
If you're hoping for actual details on the Vita Malicious game, you're going to have to wait a bit. The game just appears in Dengeki's release chart, meaning no details. It's possible that Famitsu will have actual details tomorrow, though, so be sure and check back!