*UPDATE* [2012-08-21 03:08PM UTC]
A third update has just now been rolled-out to all those in the Public Beta program. This update brings the Xbox 360 dashboard/kernel up to version 2.0.16133.0 (we rubbed our eyes too at first, but quickly realized it's "133", not "113" which was the previous update). c4eva's iXtreme LT+ still working fine with backups, and xk3y also continues to function normally as well. This update's changelog isn't as hefty as the last, and centers primarily around bug fixes, performance improvements and features for Internet Explorer, namely the ability to customize Xbox Pins with one's favorite websites. Microsoft has also integrated a third list type in the Web Hub to display featured websites, selected by MS and tailored for the user's region.
*UPDATE* [2012-08-24 09:41AM UTC]
Microsoft has decided to expand the Xbox LIVE Update Public Beta Program by accepting a new round of users, according to email invitations sent out earlier today and yesterday. The Beta update, destined for final release this Fall, allows participants early access to several new features in advance of launch, including voice search, Internet Explorer for Xbox, improved category search and personalized recommendations.
"Due to the overwhelming demand for the Xbox LIVE Update Public Beta, we will be opening up the beta to additional users. The last beta filled up in a matter of hours so be one of the first to sign up for this public Xbox beta program and see what all the excitement is about!"
*UPDATE* [2012-08-28 07:44PM UTC]
Microsoft has just pushed out a fourth update for the Xbox LIVE Update Public Beta, which now brings the Xbox 360 dashboard/kernel up to version 2.0.16145.0. Short and sweet: LT+ v3.0 working, xk3y working. We'll update this again in a bit with the notable changes once those details are available.