We have already seen rumours about Android 4.4.3 and some of the possible changes that are coming with that version of Android and now it appears that Google have started the internal testing process.
Android Police have mentioned that this particular build has started rolling out to a small number of Google employees outside of the core Android team and unsurprisingly it appears to be limited to the current generation Nexus devices.
As previously mentioned this release is likely to be a bug fix release with no new features introduced and the timeframes for a public release are still unknown, but it is likely that this will still be a few weeks away – you can stop hitting the check for updates button.
Although this is unlikely to bring any new features there are still a few bugs floating around and I for one would really like Bluetooth to be one of those fixes.