the SC-BT200 and SC-BT300 have an ethernet port,which enables them to be connected to a wired net connection for updates/special features/games over BDlive,etc..
there is some talk of Viera Cast, which is already in the states, and enables users to watch content from youtube/Amazon Video-on-Demand (VOD) online movie rental service/online photos via Picasa Web Albums, and weather reports.
its supposed to be launched here this spring, but not much else is known..
its on high end plasma,and surround systems in the states,so far.