I would bet the first place it gets released is Calum's patreon, which is where he posts a lot of WIPs.* Tortuga is totally Calum's thing, so I don't want to speak for him, but one of the objectives of our campaign is to flesh out the setting through playing in it.
*Including his cyber-horror-punk FitD game Deep in a Matrix of Flesh and Metal, which is Copperhead County's official FitD cyberpunk endorsement. The two games have exerted a lot of influence on each other!