I know the first one didn't get ported(DERP YES IT DID), but it was pretty popular over in moonland so I'm crossing my fingers that they are going to port this one. They really NEED a game like this to spur sales on Vita, over here.
The game is a boss rush, if you haven't seen the first one any. The entire game is fighting bosses, this video's second half is an example of one of the fights. The first game was REALLY good, and this one looks awesome too; I think if they did the controls right, Vita will complement the playstyle very nicely.
edit: I just checked PSN and they added the original on 7/23, I'm surprised I missed that update. Time to get a PSN card, I had been waiting for that for a long time.