They are not wrong. They publish a new 15.31 driver next week on their downloadcenter page, that's it. Final 15.31 drivers are available since weeks and beta driver since months.
Alright, going to correct myself...
Intel will Officially Support OpenCL 1.2 on the Ivy Bridge HD4000 iGPU, in about a week.
Maybe everyone will understand it now?
On topic, for the first time ever, developers will be able to target/optimize 6 to 8GB's of Memory, 6~8 x86 cores, DX 11.1, OpenGL 4.2, OpenCL 1.2 and some people still question if the next gen of consoles will be good enough or last long enough? Insane.
Anyways, I prefer the GDDR5, it will "just work". Unlike the added cache, which you need to make it work.