Both Davy Jones and the Kraken will eventually be included in the game, but the when remains locked up as tight as Jones' fabled locker however. Adding pets (such as a parrot, which every pirate must have) is something they want to do in future expansions, but they're more focused on creating end-game content for their hardcore players, which is a sign that they do listen to feedback. In fact, their biggest challenge at the moment is rolling out new content fast enough.
If you've never given PotCO a try you really have nothing to lose -- it's free-to-play. If you like what you see, and over the last few months a great deal of new content has been added, a monthly fee will get you unlimited access to all the game's content (like the poker games).