MwRYum
Major
It might be another 3 months away at the very least of it but by the looks of it, it's a bag of "about bloody time" improvements, what matters most to me is the introduction of Control Center, finally no more access controls without going down 3 layers into settings, without the need of 3rd party apps or jailbreaking. Others are minor or icing on the cake if you ask me - nicer compass, nicer looking weather app...blah blah blah...
I don't give a rat arse about its map, because it'd be a long time before Apple catch up to Google on this one - if you're with Google Earth from its beginning, you'd know how much time and money Google poured into that department.
And I am somewhat disappointed with the newer Photos, which seems to miss the option to arrange by filename...that's sucks if you read mangas on your iPad, unless you're willing to go through the trouble of PDF-ise your collection.
So...that's my gripe so far. What about you guys?