Hot Hardware published a review on the Intel's Core i7-6950X Extreme Edition 10-Core Broadwell-E Monster Processor Breaks Cover, 25MB Cache

A quote from the article:

It's a good thing Intel waited until the weekend to let slip a mention of its forthcoming Core i7-6950X Extreme Edition processor on its website, because had the Santa Clara chip maker jumped the gun, everyone might assume it was an April Fool's Day prank. That's not the case for what we surmise is a mighty 10-core CPU.

To be clear, Intel hasn't launched the Core i7-6950X, not yet anyway. But what the company did do is update its support website for its latest Management Engine software, listing the much anticipated Broadwell-E part as a compatible chip. So in that way, you can say Intel confirmed its existence, whether that was intentional or someone on the company's web team jumped the gun.

 Intel's Core i7-6950X Extreme Edition 10-Core Broadwell-E Monster Processor Breaks Cover, 25MB Cache @ HotHardware