I caught MCW's appearance on the Jim Rome radio show in my truck today by chance, and Michael said his injury was a mild but nagging thing. Nobody's worried yet, but it's kind of an unknown, too. No further elaboration.
Rome did his usual extremely polite and reverent thing that he usually does with unfamiliar interviewees (no bathrobe questions). After MCW, Rome lambasted Mike Tyson again, but not in person, obviously.
MCW was impressive in the way he articulated himself. He sounded like someone with many years in the NBA. Rome did a decent job bringing up the "tank" issue. Michael insisted that neither he nor his teammates are even interested in the concept. I'm guessing that that's because tanking would benefit most those teams that really have no hope of making the playoffs - and now that the Sixers have actually won even without him...