Second Life on December 1st: a game. All right, that in and of itself isn't all that unusual, since the virtual world has long empowered users to create their own systems and their own games. But this is still something different because it's not a user-created game. Linden Realms has been developed specifically by Linden Lab, and as of December 1st all users will be able to experience what a first-party game for the virtual environment feels like.
Second Life content creators will, rather unfortunately, be facing off against an in-house project. Luckily, the tools used in the development of Linden Realms will also be made available to the community, giving everyone a chance to play with the new tools and improve upon gameplay experiences. Whether or not this is a good thing or not for the game's overall health remains to be seen, but it may well provide an interesting boost to the community's user-created content.