That one looks interesting.
Akella is also coming out with a batch of new games similar to sea dogs. Age of Pirates carribean tales and AoP Captain Blood. Also Swashbucklers Blue vs Grey is another one from them but set in the civil war.
www.akella.com
Disney is also coming out with another Pirates of the carribean, but this one is more of a land based action rpg game..
I have to say though im a little warry of Akella games mainly because of their somewhat poor track record with fixing bugs, and especialy over them turning sea dogs 2 into Pirates of the carribean
What i would love to see is a game that takes the best elements from sea dogs/PotC, and Pirates! and put them into one game. Basicly a free form pirate game and sailing sim combined.