Re: NVidia and XRandR 1.2
I wouldn't count on any support, not even in the future. Like so many other nice things that are not supported by the binary driver, randr is an X/Linux/OSS technology. At the same time, the linux driver is a by-product of the Windows driver (do the math!).
So in addition to the fact that it doesn't (financially) pay for them to implement Linux-specific things, AND that they have other more pressing Linux problems, it would probably not even be possible or at least very difficult because the architecture of the driver is screwed up. Just look at proper XRender support. It is now already taking one year to get that right and they even wrote here that major architectural changes would be needed to get it performing. It's a Windows driver, after all.