Back before "Star Trek - the Motion Picture" there were plans to make a new TV series with the original actors. I've talked about this a few times on the podcast. It was called "Phase II." Here is some very interesting video discussing this proposed series with interviews with many Trek folks too. Fascinating stuff!
Star Trek The Lost Enterprise Phase 2 Part 1 (http://www.youtube.com/watch?v=TddfkJtMyF0#)
Star Trek The Lost Enterprise Phase 2 Part 2 (http://www.youtube.com/watch?v=kQh4jhQKCnE#)
And here is a little follow up on how that TV Enterprise starship would have looked.
Star Trek -- Phase II Enterprise (http://www.youtube.com/watch?v=A-at54tjZzw#)
That Phase II Enterprise animation is cool, that was a very odd combo they made, I'm glad they had the $ to give her a complete refit. The interviews are on the Directors cut of the DVD extras.