Haven't had a very detailed look into each update, but from I can see it's pretty standard Apple, turning small things into "revolutions" (e.g. Extensive translucency OS X in system menu's [Aero sound familiar?], and third party keyboard options and text prediction in IOS 8). Their keynote presentation execution is still beautiful though.
But what I think they have done well is the continuity of the tablets, PC, and smartphone. From the demo it looks like you can SMS, call and file share in a good sync'ing manner between all your Apple devices.
Interesting that Apple is trying to make the integration between multiple devices better, while Microsoft is trying to merge them so integration isn't necessary. Wonder which one will work out better.
CNET OS X Yosemite keynote highlights
Can't find the full keynotes atm but if anyone has the link please comment!
EDIT: Also what I found pretty cool is "Extensibility", it enables "widgets" in the notification centre, but it also let apps functionally work with other apps (not just sharing), check out 1:55 of the video to see what I mean
As much as it irks me when Apple people make wildly boastful (and tone deaf) statements like "They had bought an Android phone, by mistake, and then sought a better experience. And a better life," iOS 8 looks like a great update. I don't care for their Dropbox clone, but third party keyboards and widgets (albeit notification centre-only) might tempt me to flip back. Yosemite is 'meh' but I'm getting it for free, so can't complain.