So Broadwell is releasing soon so I thought I should post what's known about Broadwell so far, two unlocked chips the i5 5675C and the i7 5775C, notice they use "C" series branding unlike the "K" series models which Intel had labeled on their previous unlocked processors. They are going to feature a 65W TDP and Iris Pro Graphics 6200 iGPU which has eDRAM cache embedded to feed the execution units with faster memory as opposed to the system ram which is limited in terms of bandwidth. The flagship Core i7-5775C comes with a core clock of 3.3 GHz and 3.7 GHz turbo frequency. It's a quad core model with hyper threading enabled and features 6 MB of L3 cache and DDR3 memory rated at 1600 MHz native support. The other chip is the Core i5-5675C which is a quad core model with no hyper threading support and comes with a clock speed of 3.1 GHz base and 3.6 GHz turbo frequency. It features 4 MB of L3 cache, DDR3 1600 MHz memory support.
Both processors will be work on LGA 1150 socketed motherboards, thought they will only work with Z97 chipset. Motherboard makers have already started shipping out BIOS to allow support for the 5th generation of Intel Broadwell processors. The reason Intel isn't moving to 95W TDP, performance minded parts on LGA 1150 platform is due to the upcoming Skylake processors which will be running on the Z170 chipset based motherboards which will be probably shown during IDF 2015 early next month. The processors are not going to be high-performance capable like Devil’s Canyon which was built to handle higher overclocks.
TL;DR Intel are releasing 2 new unlocked chips, now called "C" instead of "K", next quarter they will feature lower frequencies than Devil's Canyon because they're not as performance and overclocking minded, they will also feature less cache and lower TDP (65W) and Iris Pro 6200 graphics.
@Die_kapitan

Minor Performance improvement compared to Haswell ; similar to the case of the I 3770 and i4770 and later the I4770 and I4970 -

Efficiency:

Broadwell is that its chips will be 30% more efficient than Haswell's ones, using 30% less power while providing slightly better performance at the same clock speed. Everyone's a winner. Reason: Intel Haswell uses 22 nanometer transistors, Broadwell's transistors will be 14nm. More head for OC enthusiasts and more efficiency especially in Laptops battery.

Haswell already made huge improvements to efficiency compared with the previous generation, Ivy Bridge, resulting in a huge upsurge in the battery life of Windows laptops last year.

Personally I will not upgrade to Broadwell , I will wait and upgrade to Intel 6th Generation Skylake:

-Intel Skylake processors will boast a totally new architecture considering they are a Tock when it comes to the Intel Tick-Tock model.
-The GT4e graphics will feature graphics improvement with more execution units compared to Broadwell
-New 100 Chipset with DDR4 Support that will replace the Z97 with new Chipset features as usual from Intel.