It will happen my friend. Like what was said earlier, it may be Monday before the system updates. Don't be too concerned.. I spoke with numerous Apple reps and they all said that if you didn't receive the cancellation email and it says it will be there by the 18th - 25th, then they reassured me over and over that it would be exactly as it says.
Plus, you got the Grand-daddy of iPad 2's, I'd be willing to bet that model is in demand more than any others, especially with the faster processor. Rest assured, buddy. I was worried for a while too, but they came through.. right at the stroke of midnight, I might add.
If you ordered early yesterday morning, then you'll still be on of the first shipments of that model - it's all a first-come first-served type thing (according to Apple reps).