According its current schedule, Intel plans a much faster introduction of the new architecture codenamed Skylake than originally anticipated. The fastest Pentium based on Broadwell was introduced in Q1 2015, in the form of the Pentium Processor 3805U that works at 1.9GHz, has two cores and two threads, 2MB cache and a 15W TDP.
The fastest Celeron based on the Broadwell architecture is the Celeron 3755U, with two cores and two threads, 1.7GHz clock and 15W TDP. It also supports configurable TDP that can limit the TDP at the lower clock speeds.
Intel plans to replace two Celeron SKUs with two Skylake successors and the same destiny awaits the Broadwell Pentium processor. From what we saw, Intel plans to launch almost the whole range of Skylake processors in Q4 2015, including Celeron, Pentium, Core M, Core i3, Core i5 and Core i7 products.
We are sure that all SKUs from Celeron to Core i7 will run Windows 8.1 / Windows 10 just fine, as it is hard to slow down a modern processor with everyday tasks such as browsing, facebooking and instant messaging / skyping.
There will still be some processors to launch in early 2016, as the transition from one to another architecture across the entire product range usually takes a few quarters. If Intel manages to keep its tick-tock schedule, there is a good chance we will see Intel 10nm processors, codenamed Cannonlake, in late 2016, roughly 18 months from now.