It's already been discussed in the comments below, but in case anyone missed it. Carl Engstrom and Algie Key will not return. Shannon Hale broke his foot and is out 4-6 weeks.
We've been hearing for a while that Carl was going to return home after the season. I appreciate his effort and his time here. He was finally starting to show some significant improvement before his injury in late 2012, but it became obvious he was never going to be an SEC caliber regular big man. With the influx of guards coming in, the Algie Key news is not surprising.
As for Shannon, injuries are never good, but this is probably the best time for it to happen. Hopefully he will be fully recovered by the time November rolls around.