With Lowell gone, I'd say this means one of three things.
A. Theo is going after Gonzalez and moving Youk to third.
B. Theo is going after Beltre and keeping Youk at first.
C. Technically, it could also mean Youk moves to thrid, VMart moves to first, and they platoon Varitek and Ramirez.
Option A sounds good to me. Option B would be okay. Option C doesn't make much sense, as the lineup doesn't get any better.