Hey Guys, as David and others have mentioned, this patch (actually it's three patches - for US, UK and German versions) is in the final stages of Activision QA.
And the short answer to "why is it taking so long" boils down to the fact that, in order to insure that this patch fixes everything we say it does, and doesn't break anything new, we need to test every aspect of the game - single player and multiplayer skirmish, SP campaigns, tutorials, SP conquest and, of course, the D3. We also need to do this for the US regular, US Best Buy, German and UK versions of the game.
Fortunately, I can report that testing is going very well. We are looking to release all three patches shortly, possibly within the week, and assuming we don't find anything new.
I apologize for the delay. Your patience will soon be rewarded.