My real questions are whether there will be a one-color variant, whether the symbol will be allowed to be displayed without the type, and how you could ever secure international trademark on four squares. My guess is that you'd have to be, well, Mircosoft. More than the logo designers, I'm really impressed by the legal team. My trademark lawyers would laugh at me.
[1] http://www.bestlookinglogos.com/2009/07/four-square-logo/
Edit: fixed to read 'international trademark'