Good question.
(Clearly, we are updating these as we bring the engineering more into the open so thank you for your patience)
This project is meant to come AFTER the Bitcoin integration and the Threshold ECDSA Signatures proposal, so it has been moved down to be started after those are completed. I just updated the Summary to reflect this.
To see an example of a project which is more baked (and a model of how these proposals should look more like) check out the timeline thread on Increased Canister Storage: Increased Canister Storage - #13 by flyq