We have known about the Samsung Galaxy S 4 for a while now, but no realase date information was offered besides "2nd Q 2013".  That changed today when one U.S. carrier has finally gave us an anticipated launch time frame.

Release date: "Around May 1" UPDATED 4/17/13 ' "online starting on April 24, with pricing set at a $149.99 down payment along with 24 monthly payments of $20 each. The Galaxy S 4 will be available in select T-Mobile stores."
Announced Carrier: T-Mobile

UPDATED 4/17/13 -  The Samsung Galaxy S 4 will also be available at Sprint starting Saturday April 27, 2013 with pre-orders beginning Thursday April 18th.  U.S. Cellular hasn't shared an exact launch date for its Galaxy S 4, but it does say that the device will be available "later this month".