We should launch the crate in earnest on crates.io ASAP, so people can start relying on it and the name doesn't get squatted.

Is there anything else that must be done before this? Anything that would be nice?

IMO the initial work that needs to be done is:

1. Code quality.
2. Better docs.
3. Design work for multi-layout and cross-language integration.

1 and 3 are irrelevant, 2 can be added in minor versions.