Don't get me wrong, I love the band, but they know how to work the media and part of that is to play down problems that they have control over. I think this is a classic example of them doing just that. It's not a good thing for the fans, but it stops a lot of bad publicity that would probably do them more harm than saying nothing. Maybe? Personally, I think a little more information wouldn't hurt them and their fans would appreciate it. I know I would. Bob is an amazing drummer and was critical to their sound on Black Parade. I don't see them being the same without him.
I agree with the comment that they don't owe us anything, they already give enough. But it's a matter of mutual respect and I think they risk losing a lot of fans over Bob leaving with no explanation.
It all seems to have been very carefully handled but maybe not in the best way. When compared to the open and, at least, possibly honest statements issued when Panic split, it just feels unnecessarily secretive.
But, then, different people handle things in different ways and I doubt there's a particularly good way of handling this sort of thing - whichever way they go they'll be criticised by someone (press, fans, music industry etc)
I just hope whatever has happened, they're all okay and it'll work out the best for all of them.