Can't say that it's anything new, but AT&T has re-released the "new and improved" version of OS 126.96.36.1997 after pulling it earlier in the month due to call quality issues. Those that downloaded 188.8.131.527 prior to it being pulled may want to re-install it, as it appears that the Software Platform has changed from 184.108.40.206 to 220.127.116.11 (as seen in the picture above). New features such as Visual Voicemail are back, and call quality is said to be "improved."
Those that opt to download the new OS, please let us know what you think via the comments section! OS 18.104.22.1687 can be downloaded here.