Got the update here in Phoenix, Arizona yesterday.
After updating, I could no longer connect to my work's Exchange server. A reboot fixed that.
But, NOW, my calendar (and only the Calendar on the Exchange account) is syncing over and over and over. You see the Sync icon on the toolbar flash on, then off. You go into Settings and Accounts and you can see Calendar constantly updating.
Guess I'll be calling Sprint later. :-(