RIP Aurelion Sol
Center of the Universe (Passive): [no gameplay change but tooltip now specifies - "The Stars can be visible to enemies even if Aurelion Sol is in brush"]
http://www.surrenderat20.net/2016/03/315-pbe-update.html
With the tooltip now explaining the stars will be visible to foes even if you're in a bush, it looks like him being incapable of hiding is intended, so he'll never be viable. What a shame.
EDIT: Look, I get he has essentially a Sion ult as normal abilities, but think about it. You can't be as useful if your team wants to bait baron on dragon. You can't pull a turn-about if you lead someone chasing you through a bush, you can't help anyone else trying to lead people into you if they can see you in the bush the other guy is running into, etc.