The ratio of the franchise isn't bad: you have the classic, the sequel with the great Hopper, Moseley and crazy chainsaw duel, the fourth with the batshit crazy performance of Matthew McConaughey, the better-than-expected remake and a pointless prequel lead by a saluting R Lee Ermy. Only the third sucks. The only good aspect about the third is the amazing Excalibur teaser trailer.
Now as for the new one? Having Moseley is a win, but we might still end up with a useless, gimmicky 3D rehash. Something like The Final Destination.
edited to add: of course it's generally to question whether we actually need a seventh Texas Chainsaw Massacre.