As for the rest, I expect X99 to be slightly better VFM proposition, especially for the enthusiast segment. This hasn't happened, like ever IIRC, for Intel since they introduced the HEDT segment & in general with DDR4 prices going down I'd say their mainstream is getting less attractive each passing gen, particularly as more & more die space is wasted on IGP.
I certainly agree. Also because, you don't really
need quad channel DDR4 for LGA-2011v3. Dual channel is fine for most consumer segment CPUs, its only the 8+ cores that benefit.
Given the (outrageous*) Skylake pricing here in Denmark, LGA-2011v3 is looking the better platform by far, and doubly so once Broadwell-E hits.
*The 6700K is ~500DKK (~$75, retailing for ~3200DKK, for comparison the 5820K is about the same) more expensive then the 4790K (retailing for ~2700DKK). Besides, sure the boards are cheaper for LGA-1151/1150 then LGA-2011v3, but for a Skylake system the CPU pricing eats a rather large chunk of that.