As I mentioned in On Resource Systems, haste affects casters different from melee, in that it increases the regen rate of our resource (cast time) but only increases the rate of their autoattacks. This too is getting fixed in 4.0, haste will now affect melee autoattacks (and, oddly, the mana regen of enhancement shaman and retadins -- I don't even want to touch that one as far as speculation goes, I'm uncertain that design will last past the end of 4.0 alpha.)
The 4.0 design is to make haste more valuable for everyone and, in Ghostcrawlers words, to make it serve its original purpose: Haste lets you push buttons faster.
However, unless some changes are made, multiple classes will be left out of this brave new world: Shadow priests, Retribution Paladins, and Enhancement Shaman.
Note: this assumes there's an actual haste stat. We don't have the full and accurate list yet of what stats will still be around, but I love to speculate and think so I'm posting anyways. Nyah nyah.
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