Ronnie's been on the PS forum, dropping hints about coming out of retirement to do a few shows, perhaps in 2009. He's also been seen guest posing (calves completely shot-free) this month.
I don't think Ronnie will ever compete again. But I do think he and his sponsor are trying to milk the RC legacy by making people think he will. This way, every time we see another Ronnie ad in the magazines, we won't just shrug it off like we do with old Dorian, Shawn, or other retired pro pics that we see them. We'll pause and check out the pic, to see what kind of size he's still carrying, what kind of condition he's in, etc. He'll do partial guest posing (showing off arms and chest while dodging calves) for a few years as well.
I think Ronnie is retired. But he doesn't plan on telling us for 3 more years.