Samyang announced the price and availability of the their latest 35 mm f/1,4 AS UMC lens: €389 (around $540) and it will start shipping in February 2011. They also published a MTF graph:
Samyang 8 mm f/3.5 Aspherical IF MC Fish-eye and Samyang 85 mm f/1.4 Aspherical IF MC lenses will also be available for Samsung NX mount.
In the US, Samyang products can be purchased on eBay.