During T-Mobile's Uncarrier event today, the company let slip that customers would be able to get the new Galaxy S4 "about May 1st." Of course, that's not a completely specific date, though we expect the device to launch on May 1 provided that there aren't any issues or delays that appear in the next few weeks.
The new Galaxy S4 will have to compete with the iPhone 5. The iPhone 5 will be launching a few weeks before the latest Galaxy, but customers may be willing to wait those extra couple of weeks to get the latest and greatest device on the market. We'll have to see how it all plays out.