GDC: Giant update to Home beta next week, says Sony
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According to this, Sony's going to make a major update to the Home beta next week, including changes to the UI, the graphics engine, the addition of the Marketplace building, the first look at game-launching and a resolution bump (back) up to 1080p.
There's absolutely loads of stuff through that link. There's no set release date for the online PS3 service yet, but it sounds like it can't be that far off. Definitely take a look.