Depends if the game was good or not :P
Good Game = Refinement all the way baby, take a FANTASTIC concept (the reason I fell in love with the game), and make it better than ever :P I'm not buying a different series I'm buying another part of this one, bring me what I love :D
Bad Game = Innovate, obviously it sucked the first time :D Fix that sheet >_> Make it into something that doesn't suck. Don't polish the turd prease.
From 0 to KICKASS in .stupid seconds.