Apple seems to be having problems this morning. I noticed when I tried to update some apps and I get the spinny thing, then the update button comes back.
http://www.apple.com/support/systemstatus/
My ipad 2 did manage to download the 8.2 update last night, but I'm going to hold off installing it until Apple gets its server problems fixed.
iBooks, iTunes, and App store appear to be offline.
http://9to5mac.com/2015/03/11/itunes-connect-down/