Thunder Cats is an American animated television series that was produced by Rankin/Bass Productions (the same that created the Silver Hawks, Tiger Sharks and The Comic Strip) debuting in 1985, based on the characters created by Tobin "Ted" Wolf. The series follows the adventures of a group of cat-like humanoid aliens.
thunder cats

The upcoming new Thundercats Animated series has a new trailer that shows a little more of what is going on

I think it looks awesome. It is certainly updated in style and animation quality, but it really has a lot of the tone and feel of the original, but looks less hokey.