Announced during the Toonami panel at Momocon, Dragon Ball Z Kai is scheduled to hit Adult Swim this fall.
Dragon Ball Z Kai is the English dub version of Dragon Ball Kai, which remasters the original Dragon Ball Z anime series with brand new voice work and, most importantly, the bulk of the filler content from the original removed. You can learn more on FUNimation’s official DBZ Kai page.
FUNimation have stated that more info will be released soon.
Source: FUNimation blog