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The creators of Second Life are making what appears to be a spin off Minecraft, in a game called Patterns.
Not a huge deal is known about this game apparently, but it does have a trailer:
It will be a sort of sandbox MMO, where players build portions of the "universe" from basic building blocks. These building blocks are patterns used to create anything from structures to trees to what appears to be complex mechanically operated machinery, complete with physics as to how an object moves, rotates, or even falls/thrown (and is destroyed). To the Minecraft Reference, Linden Lab seems to be trying to 1-Up Minecraft.
From their website (http://www.buildpatterns.com/)
Patterns is a 3D space, where you’ll construct simple and complex structures as you harvest substances and discover new shapes that can be used to enhance your creativity.
Patterns starts with simple, basic shapes and allows you to create a universe from these shapes. In future versions you will be able to share your creations with each other, then learn from and build upon each other’s creations to create an entire universe of our shared imaginations.
Each substance contains different physical properties that can cause your creations to tumble, crumble or crash down to the ground. Will your creations withstand the power of gravity?
Patterns is still in a form of development, with "Founders" having access to it currently. Seeing as how this is coming from the creators of Second Life, could this be turned into a social sandbox MMO?
Want a nice understanding of life? Try Spirit Science: "The Human History"
Recognize the voice? Yep sounds like Penny Arcade's Extra Credits.