Looking at their open-source Linux graphics stack, if they ever end up integrating FPGA fabric into their chips as a kind of dynamic accelerator (I remember reading about that being one possibility after the acquisition), I wouldn't be entirely surprised if they did the same for that. Still probably not a fully FOSS FPGA tool suite, but at even drivers and such would be an improvement over what I've heard the current state of the industry is.
Looking the pretty spectacular failure that was AMD "Fusion", I wouldn't hold my breath on succesful FPGA integration.
Fusion was the name AMD gave pretty soon after ATi acquisition to their fancy HSA concept of accelerating compute with gpgpu, especially with the integrated gpus in their APUs. It was announced with great fanfare and pomp, but never really became reality. Today their gpgpu framework (rocm) is both unpopular and doesn't even support igpus in apus.
