Well development is not going as fast as we would have liked  ....the coin team we had been working with on a solution has flaked out and not responded since first agreeing to share tech with us and then moved to requesting money before disappearing. Currently we are still working on a solution based on Coinshuffle  http://crypsys.mmci.uni-saarland.de/projects/CoinShuffle/coinshuffle.pdf....but its been slow going to get a working model so we may look to another approach if we haven't made more progress shortly.