I ordered a black 32GB Wifi only model at lunchtime (UK) on Thursday. Confirmation e-mail arrived at 12.30pm on the 8th. No follow-up e-mails about a delay and on-line it shows delivery expected on the 16th still (although some people are saying that's not reliable). However, the status has changed to "Preparing for shipment" some time in the last few hours so I'm reasonably confident it'll arrive on time. A friend who lives a few miles away ordered the same model on Thursday evening and his delivery date is estimated as the 29th!
As has been pointed out by others, it won't be the end of the world if it is delayed, but it would be nice to have it next Friday.
For the record, I'm upgrading from an iPad 2. Only got that because I needed to develop apps for some customers. Always intended to wait for the retina version of the iPad but sometimes work dictates when you have to adopt certain technology. Still, I'm not too worried, I have offers from friends to buy my iPad 2 so it'll have a good home after next week. Haven't told the wife yet (it's a business expense so what's not to like?)