Hi Graham,
I remember seeing you at Galesburg.  I wasn't there for very long though.  Next year I will be there longer, so maybe we can chat for a while when I'm there.
I'm not really sure when the boards will be available for sale.  I sent the solder paste Gerber to the contract manufacturer today to have a stencil made.  I think it takes a couple of days for that.  I still have to order some of the mundane parts tonight from DigiKey.  I've already procured the parts that have longer lead times, so I don't have any worries about not having parts.  The contract manufacturer told me they have a 2-week lead time, but I think they'll be able to turn them around quicker than that.  Once the beta testers give it a thumbs up, then I'll have more boards made (with a few minor changes, since it is rare that a board is perfect the first time).  I'll order the first batch of production boards with a shorter lead time so that I can get them out there quicker.
The prototype in Galesburg didn't have homing, limits, or probing finished yet.  But I had nailed the motion part of it, which has to be good or it isn't worth doing.
Greg