Ran across this the other day and might try it for a project I'm working on, seems like an interesting response to the increasing complexity of platforms like WordPress.
I came across that last year, when they were still in the funding stage, please report back on how you like it and if it's an improvement to WP. That would be appreciated.
I use Pelican myself. Excellent for blogs of all types and sizes. I've looked at Ghost in the past but it didn't really offer any advantages over Pelican that I could see.