According to SEMC Blog, Sony Ericsson are busy testing out Android OS version 2.3.4 on their latest handsets including the Xperia Arc, Xperia Neo and Xperia Play along with the upcoming handset to their smartphone range – the Xperia Pro. The firmware is also apparently being tested on the Xperia X10 however, no firm release has been announced for the update on the X10.
Due for release in October for non branded handsets, Gingerbread 2.3.4 should fix a few bugs and add a few features to the OS too. More details will surely become available closer to release and hopefully details regarding an update for the Xperia X10 will be confirmed too, as many X10 owners are crying out for such an update.