Availability to butterfly labs means, "Hey guys, we are available to take your millions of dollars starting now. We will sit on this cash building THOUSANDS of dollars in interest over the next 6 months, then maybe think about shipping your items. Gotta go, busy so we can't comment on any of your complaints. Will update in next 3 months."
EDIT: also, how is the trade in going to work? Will we have to ship our singles back the day we order the ASICs and not be able to mine while we wait? Or can we trade them in when the ASICs arrive?
If the ASIC arrives, then you refuse to ship the FPGA back, so this ofcourse won't work, unless you mean the ASIC arriving to their office.