World of Warcraft's newest feature called the Equipment Manager has been yanked from the upcoming 3.1 patch. While some are theorizing a delay in the patch, from what the official forums say we won't see it this time around. Hopefully just a development hiccup and it will be added in later.
Certain issues were encountered with the upcoming Equipment Manager that could not be resolved in time for release with the next content update, patch 3.1. In order to ensure that this feature meets our standard of quality, we will be taking some extra time with the Equipment Manager and it will instead be released some time after patch 3.1. We understand that this feature is a widely anticipated addition and apologize for this minor delay.
Source: World of Warcraft Forums