Personally I have no idea what these downgraded clocks will perform like compared to the 4.0/3.5 of the 4th Gen K's, but I can't see it following the 5%-10% performance increase that's accepted since sandy bridge. The 2x Broadwell cpus will be unlocked cpus, same as the K cpus with stock clocks of 3.3 and 3.1 GHz.
Because of the delays in the 14nm tech, that's all that's slated for the LGA1150, and the full attention of Intel is currently on Skylake-S, which will be seeing production in June/July and retail release in October '15 with Skylake-K proported for release later. There will only be 2x 5th generation Broadwell cpus, the i7-5775C and the i5-5675C.
