Wonder if Pirate decks will become a thing or if it'll just be another gimick card which doesn't change much.
I highly doubt that. It seems like Blizzard had an idea that Pirates would be the archetype for Rogues (due to One-eyed Cheat), but the archetype has a few major flaws inherently. Pirate decks could be a deck if there are more pirates than Kragg, but we shall see. I sincerely doubt it.
I wonder if charrrrrge is a different keyword than charge? Maybe give all pirates charge? That would be absolutely broken, but one can only dream.
I don't think that would be broken at all, there aren't a lot of huge pirates, so it's effect wouldn't be much more than a Warsong Commander. In fact, this would actually make the card worth considering to put into any deck. (other than some roleplayer's pirate deck who dresses himself as a pirate while playing it - with the pirate cardback).
Pretty shitty with the current set of cards. Pirates die too easily with high attack + low health stat distributions, and they aren't very spammable because they don't have deathrattles or multiplying effects. We need something like a Pirate version of Unleash the Hounds or Muster for Battle to make this viable. Hell even something like Imp Master or Murloc Tidehunter could suffice. I'm willing to bet Blizzard did indeed make one of those cards and hasn't released it yet?