This isn't in the patch notes, but I'm still surprised I didn't hear about it sooner. Ming writes that the Rogue talent Sword Specialization, which has been broken for a very, very long time, is fixed in patch 2.1. What do I mean by "broken?" Well, here's the talent's tooltip:
Gives you a 1/2/3/4/5% chance to get an extra attack on the same target after dealing damage with your Sword.
Sounds like it should work out to basically 5% more white damage plus a little more due to it proccing off special attacks, right? Well, that's not how it's been working. What it's been doing is resetting your main hand swing timer whenever it procs, causing your main hand to swing at that time. If it procs off a regular main hand swing, you're getting your money's worth. However, say you've got a 2.0 speed mainhand, and it swung 1.8 seconds ago. You cast Sinister Strike, which happens to proc Sword Spec. This causes your main hand to swing and resets its timer to 2 seconds -- but it was about to swing anyway, so you've gained very little from the talent. Off-hand procs share a similar fate, since they also cause main hand swings.