I just heard that Kerry Wood was starting today for the Cubs, so I went to Yahoo to see if they had any pictures up yet. It turns out that they had a couple, including this one…
Based on this picture it looks like Wood’s timing problems haven’t been fixed; he is clearly rushing (which is the likely root cause of his shoulder problems). The thing to notice is that his glove-side foot is just about to plant (which will cause his shoulders to automatically start to turn) but his pitching arm side forearm is not yet vertical. As a result, his PAS forearm will lay back or bounce especially hard and he will tend to leave the ball up in the zone as a result.
I predict a bad day for him.
P.S. I just checked on MLB.com (the Gameday pitch by pitch location function is incredible), and Wood did indeed get off to a bad start. He gave up three runs in the first (including at least one home run). However, he seems to be keeping the ball down better now.