The other change was a little more hidden in the patch notes, and most players didn't realize it would be happening until they saw the drops: Essences are now dropping in Outland in the same place that Motes are dropping. You remember Essences-- they're the elemental components of many recipes found on the Azeroth side of the Dark Portal. A few players were unhappy that Essences were dropping instead of Motes, until Drysc confirmed that Essences are actually dropping in addition to Motes-- it's not a matter of either/or at all. Essences are completely extra.
And of course that'll have an effect on the economy. Right now, Essences are selling for up to 1g a pop on most AHs (Update: and even higher on other servers, sometimes up to 15g apiece), but they still only vendor for 4s, which is pennies compared to even most gray drops in Outland. And that price will probably drop anyway, considering the market is about to be flooded with them. One solution is to raise the vendor price. And another solution, say a few enterprising players, would be to give Alchemists a Transmute Essence to Mote spell, either at a 2-to-1 exchange rate, or a long-ish cooldown, that would set the economy on these little things right. Clearly there's a need for having Essences around (how else could you enchant firey weapon, right?), but it looks like Blizzard could have put a little more thought into their effect on the economy.