It was scheduled for the 25th, but now that isn't looking like such a sure thing.
MCV is reporting that the iPad 2 has had such a massive showing in the US (the first country to receive the sequel device) that the supply just isn't there to feed additional markets at this point. Also not helping matters are the ongoing disasters in Japan- several key components are manufactured there and delays are obviously, and understandably, mounting at this point.
Also pointed out in the MCV piece is that even though the deciding factors are new, an international iPad delay isn't. In 2010, there was such a call for the device from the States that global shipments were knocked way off schedule.
Just to give you a perspective on how well Apple is doing with their newest baby, the iPad 2 moved over 1 million units- in it's launch weekend alone.