This initiative is about using the Internet Protocol (IP) suite for deep space, as described in this IETF draft. It is an alternative to the use of the Bundle Protocol to create a network in deep space.
A Discord channel is used by the community for interactive discussions and support. Send an email to info@deepspaceip.net to receive an invite.
Discussions about the specifications are happening on the IETF deepspace/tiptop wg mailing list.