I would like to see an actual Pirate class with a few abilities from Rogues and few from the Swashbuckler. More then likely a martial class with uncanny dodge(and improved), charmed life, adds half there level with skills like appraise, bluff, profession(sailor), swim, etc. Also some spell like powers at higher levels like summoning sea creatures, controlling water, wind, and weather would be interesting. Getting bonus feats like improved steal, improved trip, improved dirty tricks, etc. plus additional bonuses with those combat maneuvers. Maybe something like rogue talents but pirate themed. Maybe gets save bonuses against the special abilities of aquatic creatures, curse effects, etc. Also bonuses while piloting and/or fighting on a ship.