There are no present plans to bring back the Weta Legs. My co-inventors and friends have come out with their own versions since then, much more like our original ones, but with more options. They are making them through Area 51 in the UK. Check them out!
I believe that the company Area 51 in the UK is planning on getting them for sale very soon. They don't have anything on their site but if you contact via email, they may have more news.
They are very comfortable to walk in. Check out the ones being sold by Area 51 in the UK!