As part of the sentai anniversary Power Rangers SPD will be dubbed into Japanese. Dub voices for the Rangers will be the original Dekaranger cast. It will air on the Toei Channel starting in August.
I'm not quite sure why they chose SPD over some of the other recent series, but it still looks promising. Not to mention this is the first Japanese dub since Lightspeed Rescue back in 2003, omitting Season 3 of MMPR and Zeo, of course, which were never dubbed, so this should prove interesting in terms of audience response.
And as a "taste", here's an overview of SPD from the 30th Anniversary Super Sentai Encyclopaedia DVD, narrated by Tetsu Inada himself: