According to leaks the new line of AMD Radeon RX 500 series cards have a release date and the specifications. Other hardware manufacturers like Gigabyte and Powercolor also have their own photos further confirming the cards nearing retail release on April 18th.
Looks like the 500 series include the RX 550, 560, 570, and 580. These cards will follow the same architecture as the 400 series, so all of you VEGA enthusiasts will have to wait until the next wave from AMD later this year.
Take a look at the specs below comparing the four different cards.