Yeah, there's quite a few upgrades in the engineering of the joints: there's no bicep-swivel anymore, replaced by swivel at the (newly) double jointed elbows, the articulation at the waist has been improved, the joints at the hip seem to have been retooled (the earlier version had the right hip sticking out more than the left hip, giving the alien oddly wide hips), the knees have a newly tooled articulation that allows for swivel as well as the double joint that was present in the earlier version, and the articulation at the ankles seems to have been improved too.
The "face" seems slightly different, with the same lowered upper lip as the earlier version (different from the prototype translucent version that has bared teeth), but larger/more prominent teeth.
And, of course, the new paint apps, especially the fully transparent dome with blackened front and back.
So, overall, it seems to be a decent upgrade.
I'm not a fan of the overly blackened front of the dome and the large teeth, but I hope my LHS gets this.