Not necessarily -- that was a report for the original iPad. But, if you notice, total delivery from the time it left Apple's hands was just over 48 hours. I'm guessing they are REALLY backed up at the plant and Lantau shipping area right now. This will likely ease after the first few batches go out -- if FedEx is saying the 17th/18th, that's probably a pretty safe bet.
In terms of efficiency, FedEx is doing pretty well. Apple, on the other hand, took nearly 2 days to "prepare for shipment." And I ordered as early as I could (3:42 EST -- the earliest I've seen in this forum is 3:38 EST). People who ordered significantly after the opening time will likely have greater delays.
In short, I'd trust FedEx's estimate as the latest you'll receive it... in some cases, I wouldn't be surprised in FedEx arrives a day earlier than their own estimates.