A tweet from PEGI alerts me to the fact that more SNK classics are headed to the PSP, and presumably the Vita. This time its The Next Space, a kind of "a few months before Gradius came out"-looking vertical shooter loaded with power-ups and odd fire patterns. It actually dates from 1989, which puts it some years after Gradius, perhaps not one to rush out and get.
Guess it'll be hitting the store soon. Also listed by PEGI were side-scrolling beat 'em up Gang Wars and Chopper I.