Eyonix has been on a roll recently, posting about many 1.8 changes.
First off, Upcoming Instant Melee Attack Change, which changes damage calculations to use a fixed value for weapon speed. Effectively, this will nerf "slow" daggers.
Next, Racial Trait: Perception - Perception will now be usable from stealth. (Which isn't terribly helpful, but - whatever.)
Finally, we have For the Warlocks!, where Eyonix details a bunch of warlock changes. (Honestly, none of them look that impressive. Have to wait for 1.8 test to be certain, though.)
And, as an added bonus, Eyonix explains how +Spell Hit gear works.
Since the Blizzard forums prunes posts after a given amount of time, the full text of the comments are duplicated below.