The events themselves are not currently scheduled to go live with patch 3.3.5. We're simply taking the opportunity on the PTRs to test these events while they're up and running in case we do not have another opportunity to do so before marking these events live.
The release of the events will be contingent upon the development of other features leading up to Cataclysm, but their release will likely not coincide directly with a patch. They're events that simply need to be "turned on" when we're ready.