Lozmoid,
Pretty sure they will all have moveable turrets. A while back, Jeremy showed a pre-production pic (the white plastic pieces) of two of the King Tiger pieces and their turrets were moveable, so that at least includes Germany as well as the Italian pieces.
Now, if FMG decides this factory is too unreliable with all the missed dates and goes to another factory, which was suggested after Germany gets produced, then that may change.
As for my own opinion, I think having moveable turrets is a really cool and novel idea. However, it is not a necessary thing for these gaming pieces and if it would help defray some cost or speed up production a little, then I would be fine with fixed pieces.