The latest I heard is that the 3-way trade could include Millar going to Minnesota as well. I'm not sure why they think Millar and Mueller will solve their offensive struggles but that's their problem.
I think the holdup in this is the Red Sox reluctance to take Lowell and that Florida wants Lohse, not Mays. However, it's been rumored that negotiations are now taking place on the ownership level between Henry and Loria, who have a good relationship.
If the Red Sox can get Burnett, Lowell and Romero for Millar, Mueller and Arroyo, I think that's a deal you have to make.