Trion Worlds shared more of those legendary powers in a dev post that explored the possibilities for Rogues and Primalists. Five powers per class were revealed, although the studio has said that each soul should be getting at least three legendary power choices apiece.
The Rogue has several attractive options, with the Blademaster able to maintain two rhythmic actions at a time, the Bard given a major boost to healing potential, and the Assassin able to use stealth abilities out of stealth mode. Meanwhile, the Primalist can unleash a legendary tsunami, call the wind serpent for even longer, and utilize their protective primal ram quicker the more they are hit.
Source: RIFT