As an open source developer, I have to ask: Will this be released as open source, readily available on GitHub?
The language itself will almost definitely be open source, and I've created a MIT-licensed GitHub repo to support it as of earlier today.
The site generator, maybe a hosting service, and other such things might have a paid or freemium model to support the development of the language - but I'm not sure what to do yet. Might also just do some kind of donation backed fully open source thing.
For my own site, I wrote a text-to-HTML converter in PHP to handle the basic kind of markup I need so things look better than just having simple HTML tags on a web page.