It appears that as far as Star Trek is concerned it really is the next generation.
In a story from The Digital Bits, at the recent 2006 Comic-Con International they found out that Paramount is currently "working to release The Ultimate Star Trek Movie Collection in high-definition on HD-DVD and (possibly) Blu-ray Disc... the studio is quietly remastering all 79 episodes of Star Trek: The Original Series for eventual high-def disc release as well."
In addition to this the studio also has ideas to release "all 4 seasons of Star Trek: Enterprise" in high definition as well. There is currently no release date for any of these releases.
Lastly, 20th Century Fox is making the Return to the Planet of the Apes animated TV series available on October 3. It had only been available previously in the Planet of the Apes: The Ultimate DVD Collection.