The official under development page
for World of Warcraft has been updated today, providing a look into what we can certainly expect to see in the upcoming patch. WoWWiki has a more detailed article
covering what changes have been officially mentioned in the forums to date. When can we expect to see this patch? Well, it's always uncertain, but the amount of news we have about what's to be in the patch as well as recent posts in each class forums detailing where to post class-related bugs for live and test realms - makes me think we can expect a public test in the next week or two.