I've been doing a little math and looking at some other cases, there's a very realistic chance that Obama won't have anything to do with this case, at all. Because of the number of victims and resulting charges, it will probably be close to 7 years (or longer) before the military is done adjudicating this case. Only then, will the President (whomever that is at the time) be asked to approve a death sentence.
Before that time, neither the President, the SecDef nor the Army COS will say much about the case, and certainly nothing about the alleged perpetrator - publicly or privately. They'll want to do everything they can to avoid the appearance of unlawful command influence, which would sink the case on appeal.