Having spoken to Irix in depth at the Photography Show yesterday I am quite impressed by this lens.
Whilst it is made in Korea, I do not believe there is any connection to Samyang. From what I was told, they are a brand new company and are not owned by any larger corporation. They're designed from the ground up the way they wanted to make them.
I was told the price is (roughly) ~£550 for the 'Blackstone' model and ~£450 for the 'Firefly'. The optics are identical. The Blackstone is in a magnesium and aluminium alloy body and is weather sealed. The Firefly is not. The Blackstone also has the fluorescent markings.
It is manual focus, electronic aperture. It's available in Canon, Nikon and Pentax mounts. On a Canon DSLR the maximum aperture reads f/2.5; this is a software 'issue'; the lens is actually wide open at f/2.4.
The 11mm f/4 should be available at the end of Spring/early summer, with more (unannounced) lenses still to come. Expect other regular focal lengths. When questioned about Sony E mount, the answer is that they will likely be making some, though not necessarily this lens. Different line for E mount perhaps? Also, they may produce some manual aperture lenses in the future too.
Now, on to actual performance. As I said, I was impressed, particularly given the price. Distortion was, according to them (and their chart), less than 2%. I couldn't see any bending of straight lines whatsoever (through the viewfinder) when tested on a full frame Canon DSLR.
Furthermore, they had a catalogue of prints all taken with the lens in Patagonia. The photographer who took all of them was one of the guys manning the booth. I quizzed him about coma performance and he said it is very good; it appears they have actually designed the lens with astro in mind and considered those needs! There were a number of astrophotography prints and whilst relatively small (<12" wide), coma was almost non-existent, from what I could see. Only in one of the prints did I see one star only starting to grow wings. None of the prints were cropped either.
I would replace my Samyang 14mm with this in a heartbeat.
I hope this clears up some speculation.