Gerald Tan :
Thinking of getting a new mobo now .
According to leaks, Broadwell-K appears to be the only desktop model and requires a modified power specification (new motherboard) possibly due to its 128MB on-board L4 cache / Iris Pro eDRAM or changes to how its VRM works on Intel's 14nm process.
The final specs are still nearly a year away so Intel can very well change their mind before then. As things stand right now though, I would recommend considering Broadwell-K as if it required a new socket. Personally, I would ignore Broadwell altogether and plan around Skylake.