That's why it is called a rumor, but I have seen this reported a few times now....
My understanding is the 'mid-range' (whatever that turns out to be) will be GCN 1.2 (not an official AMD term) 'Tonga' with new UVD and 4K hardware acceleration -- the 'Hawaii' refresh loses the _90, drops back to the _80s, and gets the Tonga UVD and hardware acceleration.
The new "Volcanic Islands" take the _90 designation (and 'unofficial' GCN 1.3) with HBM and come in 2 flavors. The first stacked variety limited to 4GB (but nearly 2X the bandwidth of TitanX) launches in late Q2. The second wave of HBM uses Hynix Gen2 (like the proposed nVidia Pascal) with double the stacked VRAMs is Q4 or Q1-2016.
AND finally
lol
my understanding is AMD is doing a type of reverse-Voodoo that leads to the launch of the Carrizo APU at the end of Q2 -- the new discreet *GCN 1.3* have been baked on GlobalFoundries 28nm SHP, will launch next month as a Southern Islands refresh/replacement, and clear out the product stack below $200. Supposedly, AMD took a $58 million write-down at the end of last year to facilitate this transition.
Cut-down versions of the GlobalFoundries' GCN *Southern Island replacements* are the basis for the Carrizo APU graphics engines alongside the Excavator CPU cores (the 'guess' is the Kaveri refresh, Godavari, simply enhances the existing GPU/CPU cores). This is also where the next-gen Radeon mobile discreet comes from, replacing the 'Solar System' chips.
Now,
that's Internets rumor mongering