Finally, AMD has released its new 300 series of graphics cards, with 5 cards available as of June 18th: The Radeon R7 360, R7 370, R9 380, R9 390 and R9 390X.
If you take the time to view benchmarks and read through reviews (linked below), you will find that AMD did not really release any new cards in the 300 series, but has only refreshed the 200 series. They have taken the same GPUs from the 200 series, slightly raised the clock speeds (by ~5%), and added slightly faster RAM. The result is very similar performance to the 200 series.