Is NCSoft's Project A2 Secretly Aion 2?
This is rumorville territory so get too excited just yet. Although, NCSoft is known to use the convention "Project" and the first letter of whatever it is they're working on to designate a game. So, maybe.
Or maybe the game is actually called "A2" and NCSoft has decided they like to troll players and media—I wouldn't even be mad. We'll find out soon enough.