I do not need a solution (just sharing information)
We have released NetBackup 7.6.0.1 and Appliance 2.6.0.1 on 18th December 2013(Yesterday), Let us start logging our experience in this thread... I have been testing NetBackup 7.6FA for some time, soon I'll be helping few customers with 2.6.0.1 and NetBackup 7.6.0.1 soon.
For more details please check following few good links.
sort.symantec.com
entsupport.symantec.com Enterprise NetBackup Server/NetBackup Appliances
Good Luck for your upgrades.
Khajan Gowda