For those using Tasker, the ability to toggle GPS ON and OFF is taken away with KitKat. Which kinda sucks b/c I was using Tasker to turn GPS ON when connected to the car's Bluetooth so that Motorola Assist Driving mode will kick in and read text messages. Now, it won't turn on GPS, so the Assist for Driving is dead unless I manually turn on GPS (Driving Assist was dependent on GPS being ON, so auto toggling GPS would be almost like an ON / OFF switch for Driving Assist.
BTMono ON / OFF via Tasker was killed off when Google decided to use Google Seach and Voice Control update via Play Store. Now Tasker will not consistently recognize when those apps are launched to Turn on BTMono. It was working fine before the apps migrated to Play Store. BTMono was actually broadcasting any questions you asked it thru the car's speakers via Bluetooth (Ok Google Now, how old is Mike Tyson?) and all Nav instructions. Now no more as well.
As far as the Camera is concerned, I think the new drag to focus is stupid. The previous was of touching anything to focus and snap makes more sense and is faster. Now you have to open camera, hold and drag the circle then tap again for pic. And even when you waited for the HUD to turn green, shot-to-shot is still inconsistent as far as exposure goes.
Honestly, there aren't that many changes or features in KitKat vs Jelly. Some changes for the sake of change, white instead of blue (which makes it a little harder to read since the Notification bar is transparent and the white graphics sometimes blend in and battery life is about the same after a day's use. I had no problems with bugs / crashes / lag before on Jelly, so no difference in that. All in all, at least initial impressions, KitKat was hyped more than it delivered for me.
However, the album art on lock screen is really cool though. And the update didn't cause any crashes or black pauses for the Active Notif's, which I guess I lucked out. The notification settings have some more options on pull down, which is good.