Last Updated: July 9th, 2014
The Chromecast is slowly worming its way into every part of the Google ecosystem, but there is at least one aspect you weren't supposed to see yet. There is incomplete screen casting support built into KitKat, but it has been surfacing in very odd ways for the last few months. Rest assured, you are not alone in spotting it. Update 7/9/14: It's live now
Last Updated: February 12th, 2014
Update [2/12]: It looks like the glitch is over with. Several people are reporting that downloads are working again and everything has returned to normal.
If you've been having trouble with 403 errors while attempting to download new or updated versions of apps from the Play Store, welcome to the club. Reports have been popping up all over the Internet from people experiencing the same issue. Unlike the infamous Package File Invalid Error, the glitch appears to be persistent, preventing any and all downloads from starting.