I'm more curious to hear about wireless charging options. With the removable backs, you have to wonder if there'll be a case with Qi or Powermat options.
I remember all the hubbub surrounding Apple's change to the Lightning connector. Many people weren't happy because they couldn't use their 30-pin accessories and cables with new devices anymore.
The same will happen in some degree with a microUSB 2/3 to that new-fangled USB connector.