Pre-orders Being Pushed Back
If you already pre-ordered your ipad you should still receive it on April 3rd but anyone pre-ordering as of today it will ship on April 12th according to Apples website. That does seem to indicates that they are selling well.
For those of you who are planning to pick one up at Best Buy, they will be carrying a low inventory. A leaked document shows they are expecting only 15 units per store, according to Engadget. It looks like there might be some long lines for those 15 units.