According to the updated information from Wyam project's author Dave Glick: Wyam is rebranding to Statiq for the v3 release.
Looks like the next Wyam version will include 2 major parts: Splashdown and Wyam.
Splashdown is a static site generator application, just like all other static site generators, e.g: Hugo, Jekyll and current Wyam's static site genaration function.
Wyam will be a static generator toolkit that can be used for custom generators a user wants to build. It will also provides a library so that the user's custom application can do things like serve the site on a preview host, manage theme etc.
Please check Wyam vNext strategy
And, here is the new Statiq project on Github.