We mentioned earlier today that Sony Ericsson had started sending out an Android 2.3.3 update to Xperia Arc smartphones in Europe. It turns out the Arc isn’t alone, with Xperia Play also on-track to get its own 2.3.3 update, starting this week. Sony Ericsson announced both updates while revealing just what Android 2.3.3 has in store for the Xperias, including the new Facebook inside Xperia integration.

The Arc will see improved HD video recording once it takes its update, and improvements like better battery management, system-wide stability improvements, and more reliable data connections over WiFi will be available for both the Arc and the Play. You should also notice enhanced performance from the smartphones’ touch screens, with improved response times.

Those improvements sound nice, but the most noticeable change for 2.3.3 will be the blending of Facebook into the Android interface, a project Sony Ericsson is calling Facebook inside Xperia. All new Xperias this year will have the feature, and the company is working on bringing it to existing phones through these updates. The idea is to provide an experience similar to that offered by INQ or HTC in their Facebook phones, where you don’t need to launch a Facebook app to start sharing content with your friends. You can like tracks right from your music player, photos you’re tagged in will show up in your phone’s image gallery, and your friends’ birthdays will get automatically added to your calendar. You can check out more of the the features in the video below.

Europe’s getting its updates first, but other markets will follow in due course.