Update: Sony Ericsson UK have confirmed this, saying Android 2.1 is better than 2.2. Yep, they know their stuff.
News just coming out of the Android Community site is that Sony Ericsson will not be updating the current X10 range of devices past Android 2.1. They go on to say that Sony Ericsson will continue to bring refinements to the devices (TimeScape & MediaScape updates) as well as the dual-touch patch for the Xperia X10.
Their reasoning behind this, is that they want to focus on their upcoming devices such as the Xperia arc. If this news is confirmed by other sources, this is a shit day for current X10 owners, especially Xperia X10 owners, some of which are still waiting for their Android 2.1 update.