For starters, the Sony Ericsson Xperia X10 is looking to receive its dose of Eclair which will provide noteworthy items such as 720p video capture with continuous auto-focus, HTML 5 support in the browser, a total of 5 homescreens, and the integration of Facebook and Twitter with your contacts.
Other devices like the X10 mini, X10 mini pro, and X8 will also be a part of the Android 2.1 Eclair eating club which will tack on things like an incremental change in the four corner navigation and Bluetooth 2.1. Moving past all of the Android 2.1 news with the X10 handsets, it looks as though Sony Ericsson is planning on doing something with 2.1x which is alleged to offer an improved UX platform to both Mediascape and Timescape.
Sure it's nice for current handset owners to know that Eclair will spruce things up for their dated Android 1.6 experience, but there is no mention in the leaked document regarding any hints of Froyo for any of the smartphones. Additionally, there is no time frame on when we'll be seeing these updates begin to roll out.
Sony Ericsson Xperia X10 Specifications | Review
Sony Ericsson Xperia X10 mini Specifications | Review
Sony Ericsson Xperia X10 mini pro Specifications | Review
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source: Xperia X10 Blog