I don't see that many real game changers with the OS at the moment. Right now much of the features we've been shown have been present in Linux for a great deal of time. Hell even Mac OSX has these tricks in them already. Also the swiping between programs is beautiful in it lol but alas I kinda like the waviness of Linux which MS took out when they tossed Aero aside.
the direction is a good improvement to Windows 8. Now Windows 10 only needs to get beautiful again (bring Aero Glass back). The flat look of Windows 8.1 RTM is horrible. My eyes are aking all the time I have to use Win8/8.1 without Aero Glass and Win8 RP Theme.
I logged in just to say I'm surprised how many people don't understand the simple concept of timezones. Christ ..