Sony Ericsson released the XPERIA X10 all the way back in March, although we just saw the handset launch on AT&T here in the U.S. less than a month ago.  Unfortunately, the X10 is still running Android 1.6 even though version 2.2 of the Android OS is available.  Sony Ericsson has said that the X10 line of phones will be updated to Android 2.1 in September, but at least one X10 has already been spotted on video running 2.1.  The video, which is in German, shows off the live wallpapers that Eclair is known for, as well as an updated UI and new launcher button.  There's been no official word from AT&T on when we'll see our U.S. X10s updated to Android 2.1, but hopefully it won't be long after Sony Ericsson releases the 2.1 upgrade.

The XPERIA X10 may be somewhat long in the tooth, but with its 1 GHz processor, 4-inch screen, and 8 megapixel camera, it's still a rather capable handset spec-wise.  Considering AT&T's lean Android lineup, I'd say that the carrier would be wise to push out Android 2.1 to its X10s as soon as possible.  Once they do, we'll be able to shrink the market share of Android 1.5 and 1.6 even further into the minority.

Via IntoMobile, EuroDroid, DeviceMag