The company promised more information soon, and it arrived today along with access to the Play Test Server. The official release date for the Freya patch was given today -- Freya will be available to everyone on August 24th.
The full patch notes were released today as well, and if you want to read through them be prepared to spend some time. The list of bug fixes, new items, content additions, and so on is long enough to warrant 13 forum posts from the community manager. The notes may be long, but they're broken down into manageable sections this way, which helps quite a bit.
Until the August 24th release date, feel free to download the Play Test Server to get a feel for the patch. For a bit more of a preview, follow along after the jump for a new video depicting some brand-new emotes.