Thanks for you interest in bringing out these issues.
We had seen the thread you mentioned above and also sent a consolidated crux of it to some people in AMD.
As far as reporting issues and tracking them is concerned, I would recommend forums to be the right choice. I will forward these issues to AMD Engg team.
You can check release notes of Catalyst Driver and APP SDK to see the fixed issues and known issues.
Regarding roadmap, I hope you can understand that it is not safe to reveal roadmaps. So I can't comment on that.
From this post, I guess we have 2 issues that are claimed:
1. DMA does not work with PCI 3.0, but works with PCI 2.0 : I will try to verify that and let you know.
2. 7990 has PLX PCIe bridge, which as i understand is an advancement on the crossfire bus. I will try to check if that bridge works for OpenCL. This may be a bit hard right now as HD 7990 is just released.
AMD certainly reveals what it sees fit in their developer conferences and other summits. So may be you can wait for the next AMD Fusion Summit