I have heard some rumours about new series.
Here is what I found:

It has been rumored that with the remake of the new Highlander film underway,Producer Peter Davis is considering developing a new Highlander TV series. It will if developed focus solely on Conner MacLeod and not on Duncan.

Thoughts? I would love to see a new TV series because want it or not it somehow saved Highlander from obscurity.
And TV has not seen Sword & Sorcery shows a good time (from what I know).