When Sony launched its B4000-Series TVs, quite how it garnered the claim of being portable was a bit of a puzzlement. With the D500 and G200 Bravia TVs Sony definitely won't have such a problem, because the two sets are quite palpably designed to be carried around for use on-the-go.
The two devices differ in a couple of key ways. First up, the D500 packs a 3in screen, while the G200 sports a smaller 2in affair. Second, the larger model also offers 2GB of built in storage, which Sony claims allows up to 10 hours of recording. Interestingly both devices also support mobile EPG functionality and the recorder in the D500 is able to compensate for schedule changes so that if, for example, you're recording a cricket match that runs over half an hour (more than likely) you'll still get the whole thing saved - assuming you have enough space available.
Both sets also pack a scaled down version of the Bravia video processing engine seen on Sony's full size TV sets. It might sound slightly superfluous on such small screens but, given the comparatively poor quality of portable TV broadcasts, the need to clean up the signal is likely to be greater. On the battery life front Sony reckons the two players should manage about eight hours of TV, which isn't too bad.
Currently the devices are only intended for the Japanese market and as such pack 1-Seg tuners. For a UK release that would need to be changed to DVB-H, the mobile equivalent of current Freeview broadcasting, which shouldn't be too difficult a task - assuming Sony feels there is a market. Pricing isn't specified on the Sony site, but given the lack of a UK release date (or firm indication there will even be one) anyway, that's not really huge concern.