I think as long as it has one of those "New Low Price, Buy It Before You Run Outta Time!" stickers on it, it's the new versions with the fixed framing. The "V2" is on the discs themselves. I got mine at Best Buy, and for some reason, BTTFII's disc says V2 on it, but BTTF3's does not. However, both are the corrected versions, so no worries.
The only thing that bothers me is that mine didn't come with an insert. And I'm pretty sure that all of the new DVD sets don't have them either. Any ideas on how I can get one?
But still, 20 bucks for 3 classic movies is a damn good deal.