It appears the old Star Trek has had some major revisions. Ain't It Cool News has a link to an article which begins thusly:
Star Trek purists, take a deep breath! On Sept. 16, the iconic ‘60s series will return to syndication for the first time since 1990 (isn't it being shown on G4TV??), but with a startling difference: All 79 episodes are being digitally remastered with computer-generated effects not possible when Gene Roddenberry created the show 40 years ago. The news could cause Roddenberry loyalists to have a collective cow, but the longtime Trek staffers in charge of the makeover say they're honoring the late maestro's vision, not changing it.
As long as they don't have Kirk walking over Jabba the Hutt's tail, it sounds very cool. Ever since seeing the Deep Space 9 episode "Trials and Tribble-ations," I've wondered what Star Trek would look like with cleaner, slicker, newer effects.
I don't know if this video has anything at all to do with it (yet I don't know how it couldn't), but here is an indication of what this could be like. It's called "Star Trek Enhanced", and it features some redone scenes from the episode "The Doomsday Machine":