CoCo has been renamed as the confidential consortium blockchain framework.
At DevCon 4, we released the Enclave Ready EVM (https://github.com/Microsoft/eEVM) into open source and will have an update on CCBF in the near future.
If you have a specific scenario or project where you have a need for CCBF, there is currently a private preview. Please send an email with details on the project to firstname.lastname@example.org who will follow up. Thanks!