Will XBox users be linked to the same servers as PC users?

The topic heading says it all really. I fear if all the Xbox users are linked to the same download servers,
we may have performance issues.
Does anyone know if MS has addressed this question?
There seems to be anecdotal evidence that at busy times some folks experience issues with scenery streaming. I think there are some discussions about this on the forum. Could the addition of a lot of Xbox users makes this worse?