However, I do like Johnson and I have shared the dismay of action fans everywhere by his startling addiction to kiddie fare and tutus. It would be nice to see him kick ass again, and he certainly has the charisma and swashbuckle to play the Captain. Complexity probably isn't going to be an issue, especially given the official PW synopsis: "A fugitive whaler teams up with a naturalist, a mysterious woman and a captain of a futuristic submarine, to search for a lost underwater civilization that holds libraries of vast knowledge and a weapon with the power to destroy mankind."
Production is set to begin in Australia later this year and with McG set to do the final round of Terminator: Salvation press, maybe we'll get an official cast update. It has potential to be something fun if they get a good ensemble, but your cynicism may vary.