Garcian - more than likely N+ is going to be $10.
Why? It's not the standard flash version we've all played - the company that made N has made N+ as a standalone game with alot more content. The game is scheduled to come out for PSP and DS, most likely at $20....So the XBLA version (like Puzzle Quest) will be a steal and a deal.
It seems that now alot of games are starting to do the PSN/XBLA/PSP/DS world tour.
Back from the dead, I'm afraid.