Microsoft is hosting it's Build 2012 conference right now and you can watch it live or watch past sessions here: http://channel9.msdn.com/
I have heard them confirm more than once that if you use your own payment system you don't pay any fees. One in the keynote speach Ballmer gave and later in the talk "Windows store: how does it work" Just select day 1 then scroll down to select those sessions to see it for your self.
Recording does not appear to be up yet
Should probably be up in the next day or so.
edit: it's up now.
Edited by way2lazy2care, 31 October 2012 - 08:40 AM.