Many of the Patch 2.3 changes were pre-announced over the last two weeks by Blizzard. But today when the patch hit the Test server, many additional changes were discovered. And some of them are very interesting.
A new Expertise Skill has shown up in the notes. Based on the description given the meat of it seems to be that Weapon Skill Rating is out and Expertise Skill Rating is in. Weapon Skill Rating on an item used to decrease your chance to miss, increase your chance to crit and decrease your opponents chance to block, parry or dodge. Now that's been eliminated in favor of this new stat that simply reduces the chance for your attacks to be parried or dodged.
It looks like you're losing out, but the effects of Weapon Skill Rating were small (0.04% per point) where as the Expertise Skill rating has more impact (0.25% per point.) How this affects your overall dps I leave to the mathemagicians.
Weapon Skill Ratings on ranged items have not been replaced with Expertise Skill, but with additional +crit and/or +hit. Check individual items for exact changes. Also, some talents haven been altered to accommodate this new skill but what those talents are and how they were changed isn't clear yet.
Details have finally surfaced about the Guild Bank. We knew there were going to be 6 tabs and some permissions and a tracking function for transactions, but now we know the specifics. The 6 tabs will each contain 98 item slots for a total of 588 slots. Permissions to view, deposit and withdraw can be changed for every tab. Also every tab will show the last fifty transactions. So new recruits can't raid the good stuff.