What are some cool features coming to Android 4.4 KitKat?

Will KitKat make my Nexus 4 even more awesome? Anyone have a list of features coming to KitKat?

I am hoping for these four myself:

1. Reader mode in Chrome browser

2. Threaded conversation in the default email client

3. Ability to customize (add / remove) the settings buttons in the notification bar

4. Scrollable lock screen notifications like iOS