Wow, $389 on the 5820K is a very good deal for users who run many threaded tasks. If this puppy overclocks to 4.6Ghz, it's lights out for 4790K for many users who keep their systems for 4-5 years. The 28 lanes is not much of a limitation since you can run PCIe 3.0 8x/8x/8x/4x. PCIe 3.0 at even 4x = PCIe 2.0 x8x which isn't much of a bottleneck:
http://www.techpowerup.com/mobile/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/23.html
You could easily do 3 and even 4 high end GPUs on the 5820k. Good to see Intel giving enthusiasts the 8-core offering at $1K which at least clearly separates itself as an Extreme series, instead of minor clock speed and cache bump. I have a feeling this X99 platform will become even more popular once BW-E drops and DDR4 pricing subsides to DDR3 levels.
Can't wait to see overclocking results on this lineup.