Remember these Thors can fire and siege mode. Siege mode is like a powered up tank.

Edit: I don't think its the exact unit to replace the Goliath. Because the Goliath looks replaced by the Viking. It closely resembles it. I saw on the website it fires one Wraith missiles in air in its action shot. While it shoots the sort of connotative weaker Gatling gun when its on the ground. So the missiles seem much more powerful vs air, so it probably replaces the Goliath, but now with land and air capabilities. =D

Seriously though, those Gatling gun vs the ground units look so weak. Its like the Wraiths laser beams on the ground. Haha.