The UK will be the first place to get the Vision, and there are apparently a few prototypes to be won in London arcades. The video detailing the console has been pulled from YouTube already, but a few details survive. It will play "Java mini games", which suggests a similar experience to the "games" you can play on your cable-TV box at home.
Still, a pocket TV, despite being the ultimate 1980s throwback, could be worth buying if there are some classic Sonic games on there (ie. the first two, and no more). The Register's comments are chock-a-block with references to the Gamegear, Sega's last and fateful foray into the handheld market. It's failure was a real shame, as it was a great little device (despite poor battery life). There was even a TV-Tuner add-on.
It doesn't seem like Sega's lining this handheld up for gaming, and they don't really have a case for winning over the PSP-attached crowd. I guess they have the Sega name behind the vision, but that hasn't meant much in the physical realm since the early 2000's. Maybe it'll spark some nostalgia within all of us who tried so hard to love the Game Gear back in the day. I think my little brother still used our old Game Gear to watch TV up until 2005 or so, when he just decided to get a real TV and to stop spending ten bucks on AA batteries every week.