The folks over at the Xperia X10 blog received a document that shows the possible timelines for three Android firmware releases, which include Android 1.6x, Android 2.1, and Android 2.1x. The document also shows that the Android 2.1 update with include a 720p video recording and HTML5 will be adopted.
The X10 mini, X10 mini pro and X8’s 2.1 update will bring some changes to Bluetooth and navigation.
Unfortunately, the document doesn’t say anything about Android 2.2, so it is still a mystery when and if any of these devices will get it.
Source: Xperia X10 Blog