T-Mobile had already announced that it would launch the phone on May 1st, a date that also shows up on Staple's memo. The tentative launch date for AT&T is April 26th while Verizon isn't expected to launch it's version of the Samsung Galaxy S4 until May 30th, more than a month after AT&T's release. No date for Sprint's launch of the phone was indicated. Big Red is said to have the most rigorous carrier testing among the top four carriers in the U.S. which might explain the delay.
While pricing wasn't disclosed, AT&T has already indicated that the 16GB model would be priced at $199.99 with a signed two-year contract, and that the 32GB model would run $249.99 on contract. T-Mobile is expected to ask for a $99.99 down payment for the 16GB model with the balance paid off in monthly installments of $20 for 24 months.
Thanks, Anonymous Tipster!