Booligan's doing a proper review of it in a bit apparently, looking forward to seeing that video and an accuracy/range test.
You can run HPA in it if I'm not mistaken, so any issues w/ CO2 should be resolved with that.
Saw a couple of posts on Booligan's FB and found this as well:
Compatibility w/ aftermarket rails confirmed, milspec stock I think. Although the one thing I don't like is that it seems like they have a proprietary outer barrel so that might be an issue for people who want to run a longer or shorter gun, at least until someone releases different length outer barrels.