Yay, it's finally here!
Speaking of: Perhaps this has been fixed already, but I noticed some of the EXALT units, particularly Goons, have visual bugs on their paper-dolls seen in the Battlescape. Sadly I cannot provide pics right now, but I believe they had a weird, glitched green thing where their secondary weapon should be (usually it happened when they had a pistol and something else in the other hand).
Cool, early flying scouts!
BFG was already a thing in Piratez, I suppose the graphic was copy-pasted, unless it's slightly different.
Island of Dr. Alpha... Aka, not-Moreau?
I'm not sure what do you mean with "aliens reacting in different ways". Can they destroy your bases by missile strikes ala Piratez or not yet?
I also already built multiple HQs in the same base. Will this prevent me from updating them to Advanced HQs once I update?
Also, as for the revived weapons: I haven't tried much yet, but IMO there's the issue that by the time you unlock them, you're probably close enough to unlock Black Ops guns, which makes most of them redundant.
The only possible exception might be the Pancor Shotgun. The grenade-launching rifle seems cool on paper, but it's too heavy and lacks an aimed mode IIRC.