Helluw, one of the core devs here. This was originally an idea just to display whats possible with the Python AST. It's pretty neat. The result is an kinda fancy lisp variant with bidirectional interop, macros and all the fancy lisp stuff.
All the uses I saw listed on the blog were as a replacement for Python, it seemed like, so this might be a direction of integration that wasn't intended.
edit: Perhaps I should read more and ask less. It looks like this is what `import_file_to_module` does, right? :-)
Hy uses a metaimporter to parse the Hy code and hand the Python compiler AST. So you can import any hy file like normal Python and use the code. Its that simple.
It works both ways, and bi-directional interop is intended! Just `import hy` then you can import any `.hy` on `sys.path` :D
(yes, this means you can make Hy code pip installable, just like Hy itself!)