This Pittsburgh Tribune-Review article reports on the ongoing search for and testing of waterless fracking technologies. And this sponsored article reports on a plasma technology being applied to existing wells.
Frequent readers of this blog will find the material familiar - especially the comment by one service company official who told the Trib that his company's "technology can compete economically with water-based fracking when the cost of sourcing and disposing of water and potential environmental impacts are factored in."
I think that when it comes to deploying waterless fracking technologies, full recognition of and accounting for all of the costs and risks associated with the use of water and chemicals in fracking is the key. It's also the key to smart regulations governing the practice.