-For the changing colours, get XPosed Framework and Tinted Statusbar!
-Google Now Cards work perfectly fine for me? Can't help you with that, sorry.
-No, there is no immersive mode and ART in P6 KK.
Hope I helped!
Sent from my P6-U06 using XDA Premium 4 mobile app
-Huawei Ascend P6-U06, running Omni HYD52ROM v1
-Samsung Galaxy Tab 2 7" GT-P3110, running stock 4.2.2 Touchwiz
-Samsung Galaxy Ace s5830i, running Simplicity v5
( ^3^)O <(I'm always glad to help!!)