We haven't seen a spike as such, but that’s probably due to the time it was released since we are in Aus.
Certainly our app id on the firewalls now shows itunes-base has the largest bandwidth user, it's gone from number 37 yesterday to number 1 since IOS7 release today .... 6.5 hours -- Jason Cook Technology Services The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8313 4800