Well, I mailed them and got this reply:
In regards to your questions below, we are unable to cancel your current order as we have already ordered the hardware that will be required to assemble your unit. What Simon mentioned, was an upgrade we are hoping to announce *very* shortly that is only for the Batch 1 Baby Jet customers. This will be for folks that wish to upgrade their system while keeping their current place in line and still 4 weeks ahead of the shipping of our Sierra's.
It seems to refer to the special promotion you mentioned in an earlier message. At least they didn't ask for 10% to trade the order.

Come on guys, really? There must be a new get-rich-quick bestseller around.