because i'm a total nerd for this stuff...

The DBZ TV series is receiving an extensive "refresh" for Japanese television airing
This is a celebration of the 20th anniversary of DBZ
While based on the original animation production, it is being updated with new technology
This includes extending the frames for formatting on an HD 16:9 display (note: not cropping the image)
The original Japanese cast is re-grouping to re-voice the show (where available, and unfortunately not including those that have passed on, such as Hirotaka Suzuoki [Tenshinhan])
Sound effects are being updated
Unlike the general show, the OPs and EDs are being completely redone
While not in the above announcement, other reports are noting that the number of episodes is being reduced from 291 to approximately 100

The upcoming issue of Weekly Shônen Jump confirms that the "refreshed" version of DBZ for Japanese TV will in fact be called...

Dragon Ball Kai
http://www.toei-anim.co.jp/tv/dragon_kai/

As pointed out on Kanzentai, the kanji 改 means "renewed" or "revised". The "Z" appears to be dropped completely, but this will indeed be the DBZ TV series (at least for now; there has been no word on any other DB series receiving a similar treatment).


The opening stuff is the standard fare we have come to expect from the earlier announcements (like "Commemorating the 20th Anniversary of the Start of Dragon Ball Z's Broadcast!" and "The Son Goku Legend, Once More!! And its name is... DRAGON BALL KAI"). However, the interesting material appears under the header "The four points that make up the world of "Kai"!":

The story will be developed speedily!
"Kai" starts from the invasion of the Saiyans. This version will be re-edited to hew more closely to Akira Toriyama's original story, so the story's development will progress all the faster!

The opening and ending songs will be completely renewed!!
The opening and ending songs will together be made anew! Furthermore, in "Kai", the background music will be newly recorded. Let's enjoy "Kai", where even the music has been powered up!!

Through digital processing, the image will be made vibrant!!
All the grime, damage and noise remaining on the "Z" film will be removed! In HD, the image will be even clearer. We've carefully made the ultra-powerful "Kai" world even more impressive!

An all-star voice cast will record the lines anew!!
The original main cast, centered around Masako Nozawa as Son Goku, will reunite, yo. They'll breathe life into the characters again, to support their appeal!!