Just got the latest from Sparkfun:
A total of 87 ArduPilots have been shipped so far. A big batch of 61 of the original rev that were backordered by customers went out on Jan 13th. We're currently have another 34 to fill from backorder.
The new revision (with the 5V power regulator) has been ordered and 300 pieces are inbound. ETA on PCBs is Jan 23rd, although it will take about a week after that to populate them with components.
I expect that by the end of the month, we should have all the inventory we need and will able to make boards as quickly as demand comes in.