I'm having the same problem as emergeko. This isn't a Fed Ex issue, it is a Verizon issue. At the top of the Verizon Wireless site where it says Order Status is where we are getting the error "We are experiencing technical difficulties, please check back later".
This whole process is very frustrating. This is my first purchase with Verizon and will probably be my last. Like the other commenters have said, it isn't the fact the iPad 2 is delayed, it is the lack of information (and the fact my credit card has already been charged). The only solid information I have is what is mentioned on your Twitter site (Orders placed on 3/11, 3/12, 3/13 and 3/14 are expected to be shipped 2-3 weeks from the order date).