Some lesser mentioned tidbits about Android Kit Kat.

A quick rundown of some other features of Android Kit Kat that haven't been written about or fully explained in most places:

• At the heart of Kit Kat is the newish Linux kernel 3.8, and thus lower memory requirements (RAM), along with better sandboxing of apps.  So, older phones with just 1GB of RAM can now be updated with the newest OS version, and it won't bog down your smart phone.  In other words, a possible end to some of the fragmentation where users get stuck on ICS and earlier Android versions.  At the very least, an old phone can be rooted then updated with a ROM from CyanogenMod and others, based on 4.4.
• Support built in to allow users to switch home screen launchers.  You've seen all those mycolorscreen home screens using Nova Launcher and others, right?  Now, you'll be able to switch back to stock Android screen and your customized screens.
• Local phone calls from people not in your address book, will trigger Google to search business listings in Google Maps to find a match.  Now that's a really awesome thing, because when I get a phone call from a number I don't recognize I just let it go to voice mail and deal with it later.