Just ran across this article talking about the new AMD 500 series cards and thought I would share it, I know there has been a few conversations about performance increases so... read away
Adding to this post.. The 580's are due to be released April 18th...
Also here is a post stating that along with benchmarks
release date and more info on the 500 series
You guys need to wake up to one fact. Don't expect 1000sol/s.
They're likely not to be any faster than the previous cards. They may however be more energy efficient.
Why do you think modern cards are going to be any better than old cards?
Of course the 500 series will not do 1000 h/s, it clearly states that its almost a rebranding of the 400 series except they made a few minimal improvements. Some processor improvements which leads to better clock speeds, cost less and slightly more efficient.
I would hypothesise that an O'C'd RX580 might do 350 to 380
Now the Vega's....(!) are a different beast
I'd expect 325-330 for the RX580-8GB, tops. The stock clock is only going up 5%, and the memory speed is the same, which is limiting factor for Polaris/Pulse.