The first one, Core i7-3960X will feature six cores clocked at 3.30GHz with Turbo set at 3.9GHz. It will have 15MB of cache and since this one bears Intel's Extreme Edition badge, the multiplier will be unlocked.
The second one, Core i7-3930 is also part of the Extreme Edition lineup and will also have an unlocked multiplier. This hexa-core works at 3.2GHz with Turbo set at 3.8GHz. It has 12MB of cache while the TDP should be rated at 130W, same as the Core i7-3960X.
The final one detailed is the non-EE quad-core Core i7-3820. Clocked at 3.6GHz (Turbo at 3.9GHz) this one will not feature unlocked multiplier, will have 10MB of cache and should have the same 130W TDP. According to the same post, all three models should feature support for quad-channel memory.
You can find more here.