From the latest Kristin chat.
Brandi in Taos, New Mexico: What's the latest on Lost? Will Michael come back? Please say yes!
I can tell you that producers definitely have made an offer for Harold Perrineau to return in the new season, which they also did last season (Harold declined because he was working on a pilot). Back then, Harold was offered a truckload of money. Now, sources tell me he wants that same truckload. The question is whether he will receive it—hence, the holdup. I, for one, am happy to empty out my piggy bank and couch cushions and contribute to the H.P. Fund, for I miss him so. Who's with me?!
Source: Kristin