Sony has been sending out their media invitations, and are essentially teasing new devices.
Sony Mobile Communications as it is now known as (rather than Sony Ericsson), are heading to Mobile World Congress in Barcelona at the end of this month. Sony recently unveiled the Xperia S and the Xperia Ion at CES, so it is highly likely that these will make an appearance.
As the invite has the Xperia logo on the top left corner, there is also a chance of other Sony devices, such as the Xperia P, Xperia U and the Tapioca. It would also be nice to see a tablet or two.