I'm not sure yet, especially considering that there are a few different components to the overall thing.

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.