Sixense, the company that made the Razer Hydra, is going to be putting their new wireless upgraded version of the Razer Hydra on Kickstarter on September 12! It will have backwards compatibility with Razer Hydra enabled games. Not only that, it will also come with positional trackers for the player's legs.
Watch this video for an early look at their prototype:
Youtube.com
It should be noted that the product that will be on Kickstarter will be dev kits - not the consumer version.