Pryoff the backplate (which bends and flexes like the cases on Samsung's latest smartphones, but comes off far more easily) and you'll find a microSD slot.
We also saw people gathering around lampposts, because they had discovered they could pry covers off their bases and find outlets to charge their phones with.
The faceplates snap firmly into place, but you'll probably need the help of a coin to pry them off -- we still prefer the magnetic connection that Astro uses, rather than the snap-on designs from TB and Tritton.