After months of treading water, Android 4.4 KitKat is finally taking off. Google reports that 5.3 percent of Android users are running the newer OS version as of early April; that's more than twice the 2.5 percent that it claimed one month earlier. There's no official explanation for the jump, but it's most likely thanks to a wave of KitKat upgrades from HTC, LG and Samsung. Most older versions lost share as a result. It could be a long, long time before KitKat overtakes Jelly Bean (which dipped to 61.4 percent), but the transition is under way -- and it's only likely to accelerate now that flagships like the Galaxy S5 and new One are reaching store shelves.