I honestly, for the longest have thought they were working on it before the 4 was even released. But did not wish to include it. I cannot remember even if Google had released it, so in that case, maybe they couldn't. Just my little conspiracy theory.
Well, I reported 3 bugs one is when the S Pen features try to check for updates it crashes.
Another was when my GPS suddenly stopped working.
And lastly the Audio Device Type of Bluetooth not categorizing the devices for example headphones as headphones. (Since it would put every device as Other)
