A trailer for the third Dragon Ball Z Dragon Box from FUNimation has popped up as a mislabeled trailer for Volume 2 over on its respective Amazon listing:

This trailer is also narrated in-character (similar to the first two), though this time by Sonny Strait as Kuririn. While the trailer does not give a set release date, RightStuf’s most recent catalog updates peg the set for 04 May 2010, just a couple weeks before the first domestic release of Kai.