Can't say there's any surprises in the design of the X2. The battery door does appear to have a safety latch and you can't miss the 3.5mm jack. If you've survived the techno sound track, follow the break for yet another hands-on video from EngadgetMobile that focuses on the X2's unique user interface.
Not sure what to make of the user interface on the X2 but you have to admit it is different. The demonstrator does comment that the software is still under development so this may not be what the finished product looks like.