With the tremendous amount of crowdfunding, I'm almost certain there won't be a monthly. Plus, they'd kinda be seen as crooks if they promised the game from backing and then just popped "Oh, btw, it's also gonna cost you 15 bucks a month", which would be a horrible move on them, as they could easily make more money by players purchasing 200 dollar ships, since I can imagine that the amount of players would be drastically lower if they did charge monthly.
Exactly, I played runescape from the time I was 9 til I was 15, granted, it was only 5 bucks a month, not 13. An initial purchase plus a monthly just seems like a scumbag move. I honestly don't mind a few micro purchases on a game either.