Yeah, there will be no new alien classes, human weapons, or buildables. However, all the current stuff is changed in 1.2 to make the game more balanced. You will have to get used to how each weapon and alien class has changed, along with relearning how to build properly as the the updated structures call for different building tactics than in 1.1. Also, all the weapons are getting new models and skins, along with aliens getting claws in first person, which is sweet.