Blizzard has reacted to the supposed leak of the 1.8 patch notes. Caydiem posted the following on the Blizzard forums yesterday.

Re: 1.8 patch notes are fake

The difference with past leaks is that they occurred once the patch notes were made.

These 1.8 notes have shown up without even the roughest draft being in existence here at the office.

It's extremely hard to leak what doesn't exist. :P
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- Caydiem -
/moo

You can read the whole thread here.