Tom G over at Balls, Sticks, and Stuff interviewed Dan Meyer via email recently and posts the transcript here. It's pretty good, and it's neat that Meyer cooperated so easily. Best segment:

How did your injury come about and what is your prognosis? Timetable for return? Rehab?

I originally pulled a muscle in my shoulder during spring training but I didn't say anything but I was supposed to be fighting for a job in the rotation. That was a big mistake because I changed mechanically to compensate for pain and it only got worse. The best thing for me is that I didn't not severely hurt myself in my act of stupidity so hopefully things will back to normal at soon. Time table for my return is mid-June.

So he did something really stupid in hiding an injury, but it appears that he learned his lesson, hopefully with the assistance of a severe tongue-lashing on the part of the A's.