Which part is not a fact? Look up batman AA or AA+deferred shading on google and you will find that it can be done. I never say it is easy, i said it is possible, and "it has been done" multiple times on different games.
About the Dx11 API, it is backward compatible to Dx10 and a few Dx9 hardwares. In short, a game that is written based upon Dx11 can run on Dx10 card, this is the reason of the massive change between Dx9 and Dx10. A little history recap, Dx9 does everything dx10 can do, in fact it is a bit more powerful then dx10. The problem with Dx9 is the fact that different vendors have different features. To support it, Dx9 has a lot of "capability bits" or "CAPS" which were added through the revision. Although it is more powerful, it got to a point that the CAPS are so messy that a)there are so many of them, b)Different video cards of the same vendor use different CAPS for the same feature, so let alone different vendors, c)No one really know whether a new feature works or not without testing all video cards ever existed, d)No one really know if 2 or 3 different features of different CAPs are compatible to be utilized at the same time. These are the reasons why games were so unstable back then. Vista was suppose to fix it with its Dx10, but unfortunately, it ended up worst then Dx9. Remember?
So to simplify things, Dx10 is developed, by removing all the old CAPs and lay out a new standard. This standard is simply a set of hardware capability that hardware must have, which is also known as Dx10 compatibility. On top of that, there is a standard Dx API which uses them, this API is called the Dx10 API. (Please please please note that dynamic tessellation was on ATI Dx9 cards, but Dx10 failed to support it because it is really like a vendor specific feature at the time, and therefore didn't get classify as minimum hardware capability.)
By now, you should be able to see that you don't need to use Dx10 to utilize Dx10 features. Programmers can make calls from application layer to device layer(or even graphics layer) as long as the hardware itself supports such feature(of course the video card will support the feature if it is Dx10 compatible!)
If you ask what happens to features exclusive to Dx11? Sorry those doesn't exists. Dx is nothing more than an abstract layer to device layer so programming can be done easily. There will only be features that Dx doesn't support, but not the other way around (Else the video card won't be said as Dx11 compatible!!)
So don't wet anything if AMD suddenly release a driver that make tessellation possible through a new driver on 4xxx series. It is possible. Ask yourself, what happens of you are a vendor and have a new eye candy that only your hardware can run it, and say you will like to call it PhysY.... I believe you got the idea.
Personal attack : Check
No value : Check.
I'm too amazed how people that know nothing about programming keep making the same uniformed claims :|
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