An early build of the Gingerbread update for the LG Optimus 3D has surfaced on XDA Developers, giving us a glimpse into some new features that may find their way into the final release. The most important feature is 21Mbps HSPA+, but there are also improvements to video and imaging, such as 2D and 3D video editing, 2D to 3D conversion, and improved 3D recording quality. Predictably, the leaked Android 2.3.5 firmware is unstable and buggy, but users have reported smoother performance and camera responsiveness than prior Froyo builds. 

The official Gingerbread upgrade for the Optimus 3D is due to arrive on November 21st. While we've yet to hear about an update for the Thrill 4G on AT&T, there's reason for hope — the carrier has promised that all 2011 Android devices will receive Android 2.3.

A slightly blurry video of the update and a couple screenshots touting the new features are below.