Unfortunately they found a bug and had to redesign the boards. I've had one of these on pre-order since last year. Latest is I think they're intending to ship them next month (April).
Ok! I will keep an eye out. It is one of the most interesting developments for me hardware wise in the last decade, and I definitely want to show my support by buying one or more of the boards. Respin is always really annoying this late in, the post mortem on that must make for interesting reading.