Nothing really blew me away tbh... although the Mac linking up with your phone is cool and will be very useful for me.  
The constant updating of OSX means that 1) they can't really charge for it and 2) it seems underwhelming as we get drips and drabs with each year.  HOWEVER, this is beneficial as 1) we don't have to pay, and 2) we get things as they are developed rather than waiting for lots of features which might take 2-3 years...