IMO it will be determined by how fast HTC and Sprint want to deliver it to the EVO.  they made 2.2 Froyo a priority and they made a commitment to deliver it quickly - which they did - rather than dink around like some companies - so they have a pretty good track record so far.  i think HTC and Sprint realize that the EVO is their flagship cash cow and they want to demonstrate that it is on the forefront of the latest technology.  i think it also sends a great message to customers when they deliver fast updates.  in the end do you want to be with a manufacturer and carrier that dinks around or one that gets you the latest updates fast?  i know that i am right now very brand loyal to both HTC and Sprint because they deliver great service and value.
				
			
	