The BBC has announced a giant box set of ten stories - all of the Doctor's Regeneration stories - coming in just a few months. It includes an early version of The Tenth Planet (it will be released on its own later this year, but you can get it earlier in this box set) with a combination of animation and surviving clips of the last episode.
It does include Time and the Rani as the Sixth Doctor's regen story (ugh).
It also includes a coffee table style book with photos, stories, and details about each of the regenerations. The set will released June 24th in the UK (not sure about US release yet), and it run about 45 pounds.