Take it with a grain of salt, but if the rumor is accurate, this will be a minor refresh of the current Radeon RX 500 series. You can reportedly expect very minor performance boosts, in the 5-6 percent range.
The rumored launch date is the June/July timeframe. And with the way cryptocurrency prices are trending right now, there's even a possibility that gamers may be able to pick up cards at more normal prices!