Does this mean it's likely it is simply expanding 2 lengthwise? Or will another setup make sense? And how will these tri-hexes will fit on the board?
I assume the council tri-hex will extend the two 6 hex sea blocks outward making the board one frame piece wider allowing for more room on the starting island. The other two frame pieces from the base 5-6 extension would likely go into making the board a bit longer too. I'll see if I can prototype out a guess later on and upload an image.