I think based on his track record (short as it is) in Denver, and the comments I've read by former teammates, he's going to be one heck of a coach. It may take a couple years but discipline will be seen in Oakland, and our defense will improve over time.
I would predict you'll see an increase in the number of profile names who want to play for the Raiders, much like in the Chucky (the good one) era.
I predict we will have some problems. Some aspects of the offense or defense not going so well. But I also predict we'll see effective course corrections within the current constraints of the cap situation. If we're failing on the d-line, we can't just go out and bring in high performance replacements, for example. Some of these corrections will take time (a couple years or more). That's just the reality of a limited budget. But we won't continue down the same path over and over if it isn't working.
I predict at least one person will tell me these are extremely vanilla predictions, and they'd be right.
Want a more concrete one: we're in the playoffs in 2013. Book it. Maybe this year, but my gut feel is we'll be there no doubt next year.