It sounds like the first episode of Dragon Ball Kai will have some flashbacks to earlier Dragon Ball (non-“Z”) material, as well as some of the Bardock TV special. Very interesting!
Also, as Julian pointed out in our most recent podcast episode (which you should listen to, as we review anything and everything Dragon Ball Evolution!), the new ending theme to Dragon Ball Kai is actually a play on words similar to “CHA-LA HEAD-CHA-LA” being a spin on hetchara, which means “carefree”. While the new closing is written out in English as “Yeah! Break! Care Break”, it is a play on yaburekabure, which means “utter desperation”.