I can clear up some of the questions.
The frame is a standard 1911 size. It does have the full length dust cover like the 357 however.
It will accept standard magazines from most manufacturers.
Cartridge feeding should be less dependent on magazines due to the longer feed ramp built into the barrel.
It will accept slides from other sources if an owner wants to build with one. So if someone really wants the internal extractor it can be done that way. Personally I can't see why anyone would, but to each their own.
The frame, trigger, trigger bar, barrel and the grip safety are Coonan.
It requires a Coonan external extractor for a Coonan slide, internal for other slides, of course.
Everything else can fit regular 1911's.
Grips are 1911 compatible.
I'll go out on a limb and say that it should be one of the more accurate 45 pistols, out of the box, that will be available because of the linkless barrel/frame combination.
The barrel goes back to battery in a repeatable manner, against the inside of the slide.
Barrel, slide and sights become a unit. After that it's all about the person squeezing, pulling, jerking, whatever, the trigger.
No other calibers under consideration at this time that I am privy to.
Recoil "seems" more mild than a regular 1911, but after years of shooting the 357mag I may not be the one to ask about that.
It's built mostly of 17-4 stainless steel, like it's big brother.
Customer support should be the same as now. I believe they pay shipping on their products both ways if it requires repair.