I don't see this as a Matrix Reloaded situation at all. Terminator Salvation seems more apt. That one looked pretty in the trailers but fell apart when it came to story. Plus that also was trying to reinvent an old franchise and start a new series with it. Not to mention they had a mediocre script and thought they could fix it by hiring good people after the fact. I hope thats not the case here but it might be.
I really hope my pessimism isn't warranted because I want to enjoy this movie just like I wanted to enjoy Terminator Salvation. I like the world of Tron and I think it has a lot of possibility. I'm worried this will follow the same outcome as the first Tron in the 80s and remain a geek thing.