Pretty sure there is something being worked out in the background to make this happen.
If Paizo had to drop this project and ended-up losing the money invested in this (or had to heavily invest into further re-editing to make it system-agnostic or for Project Black Flag), it would hurt the shreds of the reputation and respect the Tower-Dwellers of the Shore still command.
I mean... as far as I know, this was announced, developed and put into pre-orders (and possibly some printing has already been ordered) well before any talk of changes to the OGL. This thing was initially due to release back in November.
I also remember there being mention of a grace period mentioned by the aforementioned Tower-Dwellers. I do expect this to be released... and then be the first and final Pathfinder product for Dung & Drag.