Core i7 875K processor (2.93 GHz - with 4 cores / 8 threads)
Core i5 655K processor (3.2 GHz - with 2 cores / 4 threads)
The difference between the 650 and 655K is the unlocked multiplier only.
One problem though was that Intel did not have an 'unlocked' series for their mainstream to lower segment high end processors. And there's definitely a market for that, and as such on socket LGA 1156 Intel now releases two K series processors.
The Core i5 655K will cost roughly 216 EUR/USD, a tad high being a dual-core processor. And the Core i7 875K will cost 342 USD/EUR, which I feel is a really fair price for a quad-core processor in this genre.