Well, they still need CF, 3B, RP, and a true ace. CF or 3B is the biggest need that shouldnt be too hard to fill. We could use a good veteran MR, but it isnt as necessary as CF/3B. A true ace is more of wishful thinking - we would need to pay an arm and a leg for one, and its possible we could be knee deep in true aces within 2-3 years, so signing one for much more than 2 years would be a risky move - not saying Id turn it away though.
White is easily moveable - Maroth is an option. One of the pitching prospects could be moved for the right deal. Obviously no one would lose sleep over moving Sanchez. Pena could be dealt, but it would be a mistake. Then theres always Urbina.
I do see the Tigers making another move possibly before ST - we'll see.