A pleasant surprise in iOS 8.1.1, reported by Rene Ritchie at iMore:
iOS 8.1.1 not only provides bug fixes and performance improvements, especially for iPhone 4s and iPad 2, but it also comes with a nice surprise for all iPad owners — it returns about half a gigabyte of storage space.
After hearing about it from several readers last night, I tested it on a couple iPads in my possession, and in both cases post-update storage availability grew considerably. My iPad mini 3 it went from 7.5 GB remaining to 7.9 GB remaining. My iPad Air 2 went from 40.9 GB to 42.8 GB.
This is most especially welcome on all of those 16 GB iOS devices out there, including all of those newly shipping entry-level iPhones and iPads (which is a shame in and of itself, as noted by John Gruber and others). Once you start taking photos and videos and start installing apps, that is precious little space, so half a gigabyte can go a long way.