Fabric is a blockchain project in Incubation proposed to the community and documented at https://docs.google.com/document/d/1XECRVN9hXGrjAjysrnuNSdggzAKYm6XESR6KmABwhkE. Information on what Incubation entails can be found in the Hyperledger Project Lifecycle document (https://github.com/hyperledger/hyperledger/wiki/Project-Lifecycle)