So the main question is, what's new in Skylake?
Though much is not known about this 6th generation of Intel's CPU, we can surely say that it will be a bit better than the older generations. In fact, we can say that we'll most likely see a modest improvement to both application performance and a good improvement in battery life (when it comes to mobile products).
Will new Windows 10 PCs run on Skylake?
That's is a NO. Windows 10 launches on July 29 while with all indications, Skylake will be launched somewhere in August. However, there is enough assurance that there will be no compatibility problem between the new Microsoft OS and the Intel processors.
Is this a big step?
Probably not. As we all know, Intel enjoys releasing its updates in "slip" and "slide" approach. The "slip" represents a major structural
change, such as moving to a 14nm manufacturing process (which refers to
the size of a transistor on the chip), as happened with the fifth-gen
Broadwell chips. That was an improvement on the prior 22nm chips that
appeared in 2013, codenamed Haswell. The "slide" represents a refinement and incremental improvement on top of that, as in the case of Skylake.
Interestingly, the purported post-Skylake Intel chip generation, code-named Kaby Lake, is also keeping the same 14nm process, bumping the expecting shrinkage to 10nm manufacturing to the subsequent generation. That 10nm chip is currently code-named Cannonlake, and now expected in late 2017. One could say Intel plans on releasing two "slip" generations of chips in a row.
Interestingly, the purported post-Skylake Intel chip generation, code-named Kaby Lake, is also keeping the same 14nm process, bumping the expecting shrinkage to 10nm manufacturing to the subsequent generation. That 10nm chip is currently code-named Cannonlake, and now expected in late 2017. One could say Intel plans on releasing two "slip" generations of chips in a row.
From all indications, no one should actually hold off buying a new PC or Mac because of Skylake cos there won't be any major upgrade and it will of course take few months for and upgrade to arrive to your preferred brand.