From the looks of it AMD is preparing the launch of the Radeon R9 380X, not to confuse with the 380. As so often, it is XFX who has some photos available on an Asian website. The 380 series are Tonga based, and that X indicates a higher shader processor count.

The Tonga GPU has proper DX12 support as it is based on GCN 1.2 architecture. This X model should get 2048 shader processors in its 32 compute units The product would get 128  texture memory units and 32 ROPs. The GPU will be tied to either 3 or 6 GB of memory that has proper bandwidth over a 384-bit wide memory bus.

At least that is suggested, it would make more sense to see a 2 or 4 GB model tied to a 256-bit bus, but until it launches that will remain to be a question. XFX will be offering a "Double Dissipation" model. As rumors suggest, volume production is on well its way for the R9 380X is reportedly underway. I found the R9 380 to be a surprizingly good product aside from the 2 GB model limitation, can't wait to see this one out.

AMD R9 380X Tonga spotted with 2048 shader processors