If you didn’t see the OS Keynote I suggest you to have a look. There are so many new things coming to your iPhone and iPad you will be amazed. Not that im lazy but its kind silly to write all about it if theres are already so any people who did. what i will tell you is that I’ve been using it now for a couple of weeks and yes it is truly very cool stuff.
Next to iOS8 there was of course the introduction of the new OSX, Yosemite with a tons of new features and lots of little changes, one thing im really found about is that you will be able to make phone calls with your iMac or MacBook. Im use Yosemite now for a week or so and sure it is still bete and not all is how it should be but im very happy with it and can’t wait for it to be released.
Check the special page at the apple site