I emailed Jack about dust caps and cranks a few years ago, as soon as the Cook Bros. site was resurrected; I never got a reply, and internet rumors suggest that I shouldn't hold my breath.
There was a thread on here about doing a group buy (maybe it was just dust caps rather than cranks?); not sure what happened.
I have never seen a set of the new cranks anywhere except the CBR website. The wwww rumor-mill (either here or VRC) hinted that the cranks were vaporware, and that the new website only functioned as a place-holder for the owner to continue attempts to sell the brand name.
Sorry that I can't provide anything more than speculation & third-hand rumors. Hopefully someone else can contribute more useful info? As I said, even offering to send them money didn't produce any response.