There's little point in this part. Clock-for-clock it's no faster than 1155 i7s, and it actually costs more because of the platform. To get an X79 motherboard that's comparable in features to its P67 counterpart you have to pay about $75 more, and if you want features like eight DIMM slots you have to be ready to pay over $100 more. Quad-channel memory is obviously 2x more expensive than dual-channel, too.
The only way this processor makes sense to buy is if you're doing professional video or photo editing and therefore need more RAM support, if you're running multiple VMs, OR if you'll be using many RAID cards or something like a Radeon HD 7970 in CrossFire since running it on PCIe 2.0 x8 means a penalty in some games of 10-15% in comparison to 3.0 x8 or 2.0 x16. Otherwise, better to get the 2600K. It'll be cheaper upfront, cheaper to run (consumes less power), and you'll be getting the same performance if you were thinking of OCing.
By the time someone with a 3820 would be looking for an upgrade, which would probably be two years or more from now, Haswell and Haswell-E would have arrived. Buying this chip because of the "future-proofing" of the platform is not very smart, IMO.