The official website for Dragon Ball Kai notes that the new theme song will be premiered at the Tokyo International Anime Fair on March 20th, and the singer of the song will be there. In addition to that, Masako Nozawa will be on-hand and interviewed.
Still waiting for some type of confirmation on whether we are getting a new song, though. Is it a re-make of either “CHA-LA HEAD-CHA-LA” or “We Gotta Power”…? Is it an entirely new song? Who performs it…?!
Big thanks to Rachel for a couple translation clarifications.