Bluefever was the gamefaqs leaker who leaked Gunbreaker, Blue Mage, Alphascape bosses, Viera, etc. He said the there would be 2 new jobs in 5.0: Gunblade and Dancer. He said Dancer was a healer. Given that he's been 95% accurate so far (his only inaccuracy was timing of reveals and said the final boss of Alphascape would be "Adam and Eve", it's safe to say Dancer will be a healer.