IMO, it's too early to tell. The preseason is no way to evaluate the teams who were strong last year.
LA has to be a dissapointment to their fans, simply because they don't have Shaq anymore. I'll be shocked and very impressed if they're in it at the end. My perception is that they're no longer an elite team, Kobe is going to need help to accomplish anything.
I wouldn't count out Detroit to reapeat, but I think they're vulnerable to Indiana- who would have won except for the injuries.
With all the line-up changes, I'm not even sure who the elite teams are besides San Antonio and Minnesota.