Originally Posted by Carbon 
Guys Bioware is NOT Bethesda; nobody is giving the money upfront for exclusives.
I have no idea if this rumour is true or not but assuming DA3 is in a position to be a launch title for a next-next-gen console, I have no doubt Microsoft would enthusiastically discuss exclusivity.
No, it's not Halo, but you need a range of genres for a good launch.