User blog comment:Emptylord/Leaked Champion: Vel'Koz/@comment-4290320-20140117171920

Theory #1: He may be the key to the invasion, as someone stated before, because it seems that when he uses his E, it looks like he's opening a portal to the Void. Anyways, it seems that he is one of the key figures in the invasion.

Theory #2: Vel'Koz could have sent Kha'Zix and perhaps the other Void|Kog'Maw creatures|Cho'Gath, as a way of scouting what perhaps seems the defense they shall face during the invasion?

Theory #3: Vel'Koz sounds similar to well cause, hinting to portals or gateways?