Last week I mentioned that Samyang will be releasing two new APS-C lenses this summer. According to Samyang's Facebook page, one of the new lenses will be 16mm f/2 ED AS UMC CS. The US price will be $449. Here are the known specs:
Please note that at the 2012 Photokina show Samyang announced a 10mm f/2.8 ED AS UMC CS lens that has not been released yet (for APS-C cameras).
A new Samyang 50mm f/1.2 lens is also on the roadmap for 2014.