Finishing the applications chapter has been a massive time sinkhole! I wanted to make a survey of all the cool things you can do once you have the tools of linear algebra under your belt, but it's proving to be too much (Chapter 8 is getting almost as long as the rest of the book).

In the coming weeks I'll be going over the latest draft and I might do a scope-cut, in order to get it done more quickly. In summary I'd say end-of-April for "dev close" and then probably a month for the final editing with my editor, so June 1st for official release.