Here's a nice and simple change that recently showed up in the official patch notes on the 3.1 PTR: Now, when someone loots a badge or emblem, everyone in the raid or party will automatically receive their proper emblem. This doesn't apply to people outside the raid instance though, so no twinking your lowbie second account character while they wait outside the instance, sorry.
It's a minor change, but still a welcome one, since it's sometimes easy to forget to check the corpse when you're not in charge of loot and would rather be focusing on getting ready for the next pull.
Speaking of nice instancing changes, this is something we've actually reported on before, but now it's officially in the patch notes and everything: Come 3.1, you will get a confirmation box when you're in danger of being saved to an instance so you know what you're getting yourself into. If you click no, you'll be teleported to the nearest graveyard. Hopefully that'll cut down on those annoying instances where one of your group members forgot he already cleared Sarth that week and got you all saved.
Patch 3.1 brings us Ulduar, dual specs, significant changes to all the classes, and more! We've got you covered from top to bottom with our Guide to Patch 3.1.