I picked up three 120 rolls of this new film while I was on a recent trip to the USA. CatLabs say it's an entirely new film, not available elsewhere in any other form - ie not a repurposed aerial film or surveillance film. It's something they've contracted a manufacturer to brew up exclusively for CatLabs.
Despite the 320 name, they recommend it's shot at 200ISO which is what I did. Though I was using an 85 year old camera and guessing exposure without being wholly accurate. What I got was quite contrasty images, which are pleasant when the subject matter is suitable. I was shooting in quite bright conditions most of the time and I got several photos including family portraits that I was really happy with.
Still need to experiment with this film but it does appear to be different to anything else, has it's quirks and isn't the cheapest. But the high contrast photos it gives definitely work out well for subjects like the pickup truck in my sample images, and for portraits of Caucasian people.
Image taken with a 1937 Zeiss-Ikon Ikonta 521/15 folding camera, processed in Microphen stock strength. Would be interesting to see what a more modern camera can do with this.