Judging by AMD’s own website and some retailer leaks, AMD will introduce three distinct memory module series. Entertainment class modules are rated at 1333MHz (9-9-9 latencies), Ultra Gaming Pro modules run at 1600MHz (11-11-11 latencies) and there’s also the Enterprise series, but it hasn’t been spec’d yet.
The first Radeon memory modules have apparently already gone on sale in Japan. You can check out some revealing photos here.