Games Hub:
Games Hub will have much deeper Xbox smart Glass integration and the games will be arranged in a grid rather than a list as it is now, it seems.
HERE Maps UI:
The UI in below image is certainly different from what we have now on Windows Phone 8 and has search bar on top with here logo on the left. Both these are absent now from HERE Maps’ UI. Also the bottom bar of “search, places and collections” is also absent in the above image.
Don’t ask whether this is real or fake! It increasingly looks real, but can be handiwork of some smart “Faker” as well. For the time being enjoy what looks like really nice Windows Phone 8.1 concept, which will be really great if comes true.