At this point, they can't reasonably expect delivery until July, at least. By then, by my guess, the hashrate should be at least 300-400GH/s. This would be their starting point. Optimistically, the network growth should have become constant by then. So by my guess, 13-18 BTC/day. This will last for 14 days and decrease. The decrease will happen every 14 days. These are based on my calculations around the information I've gathered about Avalon, ASICminer and BFL. (20+40/12+72/55+??) and BFL_Josh's claims on delivery if you pre-order now.
I am assuming that all companies can get their initial products shipped/operational by the end of March and will be building and shipping additional units at a more gradual pace after that.
Assuming BFL ships all their chips by the end of the year and everyone else in the game doubles by the end of the year, we are sitting at just under 900TH/s on Jan. 1, 2014.
So let's say an eventual decline from 13BTC/day to 6BTC/day, by year end. Let's assume they get it late July: so ~11 target periods. Lets say 50TH/s increase per target period from 400 to 900
T1 -189
T2 -168
T3 -151
T...
T11 - 84
=1361 BTC = 37563.6 USD before power cost at current exchange rate
So, assuming you paid in BTC, you could expect to earn all your BTC back by end of year. If you didn't pay in BTC, you can only hope the exchange rate holds up to what it is now.
This is my take, since I am bored at the moment. But I am also tired, so my calculations could be off