None...for now at least. Official Facebook app only works with 8.1 though. Everything seems to run faster with 8.1. I don't get the constant "webpage is not responsive" issue with IE 11 like with 8.1 preview.
Swipe up from bottom part of the screen will show all apps. New downloaded won't show on the start screen too, it will be in app list instead. I agree, much faster and more functional esp the music app! Need to explore more and see how much improvements there are. I also like customizing the apps - easier to use and more options
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