last month, Android KitKat has gained 0.7% to hit 2.5% of the ecosystem. Given that KitKat is just starting to see updates to non-Google devices (Nexus, GPE, & Moto), so the number should start to rise a bit quicker now. And, once the Samsung Galaxy S5 is released in April, that number should see a significant spike in May and June.The movement isn't all that much, but it is movement nonetheless. Since
Android Jelly Bean (4.1, 4.2, & 4.3) also saw the biggest bump of any dessert, up from 60.7% of the ecosystem to 62% even. Ice Cream Sandwich and Gingerbread continued to slowly slide, each dropping 1% off of their totals. Just over a year ago, we asked: should developers start adopting an Android 4.0+ policy with new apps? The question was controversial at the time, but maybe not anymore.
source: Android Developers