ROM OFFICIAL KitKat 4.4.2 Asus Zenfone 4. Asus zenfone 5 & Asus Zenfone 6

UPDATE 2014 Oct 1: OFFICIAL KitKat 4.4.2 is annouced.
*** WARNING: I am seeing too many problems from a lot of device after updated to KK. Wifi, Root, miracast, etc ... DO YOUR OWN RISK ***
http://forum.xda-developers.com/showpost.php?p=55780412&postcount=637
*** ROOT is not available for KitKat at this moment ***
*** To maintain root, enable survival mode in Root app when you are on 1.18, then update. Read more from post # 775 ***

Zen 4 (A400CG):
CHT: Download
WW: Download
TW: Download

Zen 5 (A500CG - A501CG):
WW: Download
CHT: Download
TW: Download

Zen 6 (A600CG - A601CG):
WW: Download

Source