That shouldn’t be a dealbreaker for most of you since shooting pictures with your tablet might not be the best idea, but interestingly it seems that Asus and Google initially planned to include a rear camera. Or at least the whole design is built around that idea. Or Asus just used a previous design.
In either case, there is an empty spot for where the camera should have been placed with all the connectors, but... no camera. It’s all evident in a detailed unboxing by XDA Devs - the camera part starts at around the 5:30 mark, so check it out below.