They've taken the current system that allows you to select your available roles (healer, tank, or dps) as well as select if you're willing to lead the instance. One thing that should help out is the ability to earn emblems as well as gold for doing just a completely random pug each day. While some of you might be groaning at this thought, they are willing to reimburse you for the inconvenience with 68G for completing a random level 80 heroic. This money scales based on how much of your party is random and how much is premade. The less random your party is the lower the cash return.
It's still early in the PTR and several features, like the ability to use the LFG panel to look for a raid, don't appear to be completely finished yet. I've included a gallery of what the new interface looks like thus far.
Patch 3.3 is the last major patch of Wrath of the Lich King. With the new Icecrown Citadel 5-man dungeons and 10/25-man raid arriving soon, patch 3.3 will deal the final blow to the Arthas. WoW.com's Guide to Patch 3.3 will keep you updated with all the latest patch news.