Namco Bandai Games has recently released 10 screen captures from the 30-minute animated special, Dragon Ball Z: Plan to Eradicate the Super Saiyans. Last week it was announced the special will be included on all copies of Dragon Ball: Raging Blast 2.
It was, however, unclear whether Plan to Eradicate the Super Saiyans would come in a choice of English or Japanese audio. FUNimation, the distributor for the Dragon Ball Z anime in the United States has recently cleared that up via their Twitter account. They tweet that the special will be in Japanese and will feature English subtitles. There will be no English-dubbed version, at least not with Raging Blast 2. The reason is the special comes straight from the Japanese anime studio, Toei Animation, and FUNimation did not play any role with it.
It is unclear if the special will be dubbed with English audio in the future, but for now we can happily await the English-sub release with Dragon Ball: Raging Blast 2!