I have to say, I dont really know, but late 2016 or 2017 sounds reasonable for 10 nm to me. It is a bit of semantics perhaps too. We are already a month into 2015, and we dont really have a strong line-up of 14 nm products. However, there were a spattering of 14nm products out before the holidays, so technically intel reached their guidance of 2014 availability. Same could easily happen with 10 nm.
What I am really more concerned with though, is the quality of the products. Being late is one thing, but being late with an underwhelming product is quite the worse situation. So far, I think that would have to describe Broadwell. And I dont think the excuse that it is the formfactors hold up, because the product is late already, so there should have been extra time to refine the rest of the package. The only compelling product that I have seen with Broadwell is the Dell 13 inch laptop, which seems to have adequate performance and exceptional battery life. But until we see a complete test (hint to this site!!) we wont know for sure how good it is and how much improvement is due to Broadwell vs Haswell.
I am also very concerned that Skylake is going to disappoint. Despite intel saying the problems with 14nm are solved, Broadwell is not really that impressive, and Skylake will be built on the same process. It almost seems like intel is getting into what I call the "NCS" that has plagued another company, i.e. "next chip syndrome". It is always something just over the horizon that is going to transform the product line-up. With intel it is graphics and BOM costs that are trying to be improved, but after all the delays we are still in the not quite there yet situation. I fear the same fate for those who were hoping for finally some substantial cpu improvement in Skylake. (I seem to recall the "wait for haswell" when ivb came out, and that turned out into a decent but not spectacular improvement).
And believe me, I take no pleasure in saying this. I dont think anyone could classify me as an intel basher(although there are plenty of those). I am a die hard x86 fan, and would love to see intel take a big bite out of ARM/Android in the mobile field (without having to resort to contra revenue to do it) an make some big performance gains on the cpu side of x86. Unfortunately, all these delays have come at the worst possible time in relation to making inroads into the android/arm ecosystem. It just gives arm more time to refine their process nodes and become even more firmly entrenched with stronger products.