Although a few sets have been sold at cons, they're not listed on the Eureka site yet.
I've actually had an email exchange with Ian Marsh of Fighting 15s (Eureka's UK stockist) this week about this very topic. In answer to when he'll be stocking them he replied "Sometime later this year (first half I hope). I have just emailed an order for them to Nic at Eureka so I can have them in stock when they are officially released."
Personally speaking, soon isn't quite soon enough for these gorgeous minis!