The PV to this season did pretty much explain that if you want to find out.
Unless it's going to be a filler arc, no, I don't want to find out.
Originally Posted by KrayZ33
The giant scene was a bit stupid in my opinion. I mean, that thing wasn't exactly sneaking around and they (or more importantly, the observers that spotted the phantom gate guy)didn't see it until it was this close?
Well, we don't know what all his powers are yet. Maybe he has camo or can move underground.