T-Mobile has one-upped AT&T by offering the BlackBerry Z10 for preorder to businesses today. That is a day before AT&T offers them tomorrow. T-Mobile is still being cagey about the consumer launch date but told Reuters it would be before the end of the month. We are still waiting for Verizon to crack and announce their launch dates.
Check out the T-Mobile Business page here and reach out to your business sales rep if you have one for preordering