They do not seem to be stand alone titles, but downloadable apps. In this day and age, with the rise of smartphones, I think that's fine. But let's not confuse them with "launch titles" in the traditional sense. That's not what they are.
NicoNico Douga is supposedly free, so lumping them together with paid box titles could come off as slightly misleading. Many of these titles do appear to be boxed paid titles, however.
Sony did state that over 100 titles are currently in development for the PS Vita and showed big titles like an HD Zone of the Enders collection that is Vita bound.