The dual version is being worked on. It's hard to keep the low NF and keep the LNBF stable at the same time, specially on a dual.
Keep an eye on satelliteguys.us or our website, once released, I'm sure Iceberg will be one of the first to test it out!
I see on the WSIDigital web site that they now have a dual version out, the DMX522. Looking foreward to a review on this one.