I'm really confused... it's being reported all over the place (initially at IESB) that Thomas Jane (who played the title role in the first movie) stated that the script for Punisher 2 is being written and production will start in a couple of months.
I haven't been able to find sales number for the DVD, but according to Box Office Mojo The Punisher pretty much just managed to break even world-wide. The first one was pretty much universally slammed by the critics (including me) and movie viewers (if the box office numbers mean anything), and didn't bring much of a profit. As far as the comic book fan base, it didn't make that group happy either.
All I've heard so far as that the next one will take place in New York City, which is where the first one should have taken place.