According to Jordan Bastian, the Indians will be sending knuckleballer Steven Wright to Boston in exchange for Anderson.
Just some basic thoughts on the two players:
Anderson is a 24-year-old first baseman who has spent the last three seasons in AAA. He's a patient hitter, but hasn't hit with the kind of power expected of someone with his size (6'4", 215 lbs) and ability. He was rated very highly as a prospect in several years ago, topping out on Baseball America's prospect list at #17 before the 2009 season. Over the Monster has more background on Anderson.
Wright is a 27-year-old pitcher who has recently started to learn the knuckleball, and by most accounts has a good one. He's still a project (he's struggled at times in AA), but he has a decent shot of being a major-league pitcher. Perhaps they see in Wright the potential to become another Tim Wakefield.
I'll have much more to say on the deal later on tonight.