dio from Linden Lab is finally available to the public after months of speculation, when it originally seemed to be a text adventure game; but as it turns out, it's more ambitious than that -- watch Linden's intro video, which is clearly intended for a mass market audience:

So dio (small d) is a web-based platform for user-created interactive experiences that may resemble classic text adventures, but can also come with photos, audio, and video. In other words, this is for much more than making adventure games. Forbes has an exclusive look, in which a Linden Lab staffer envisions dio for, say, "a hotel that’s trying to find a new way to advertise and make money can recreate their hotel in dio, and then make a short and easy game that takes a few minutes."

Yes, make money, because that's another hook to this: Creators of dio "rooms" will eventually get a cut of the revenue made from the platform, according to the Forbes article. And not just revenue from advertising, but to judge by dio's Terms of Service, potentially from Linden Dollars, just like Second Life: