Yes, the touch screen controls have to be on the back.
Apple if I am not mistaken has a patent on screen touch controls. Sony would be looking at a multi-hundred or billion dollar lawsuit if they were front screen touch screen.
Here is the link on Apple acquiring the touch screen patent from January 26, 2009:
http://www.google.com/hostednews/afp/article/ALeqM5jxlJ5lpRZOi6UTNEitAwEgfopsVQ
Google "Apple patent touch screen" if the link scares you.







