AMD had something with the 7970 already, but couldn't make a name for its FirePro variants. Not enough support, libraries, languages, debuggers, or maybe they were not well known enough. But then the GTX Titan pulled the rug under it.
Now we're still waiting for HSA, or Opteron Kaveri (or maybe rather Opteron variant of Carrizo)
On the consumer space AMD seems to gain foot, with Adobe using mostly OpenCL.
3D rendering engines is another place to get hold, that 16GB card might be very useful there (though DP is not greatly needed in that application) and then maybe industrial/medical/scientific apps to visualize tons of data, that kind of stuff.
HPC market? I'm not aware of anything happening. But that's simply my superfical perception.
In HPC, the customers write the code [/edit : there's also the big name Linear Algebra libaries and such to reuse]. They don't care so much about the unit price (some department budget pays for it) ; density and power are important anyway ; but foremost they're worried about writing that code cleanly, easily, debug it and have it scale.
And there I'm just ignorant of what stuff is going on lately (what is there already, OpenCL 1.2, C++ AMP, HSAIL, some-thing-I-forgot-the-name-of) while nvidia simply says "Looks here! CUDA 5.0!", "Now with CUDA 6!"
("By the way, we have FORTRAN")