» Sun Apr 10, 2011 9:29 am
When they feel like it. I don't think that there is any "traditional" time to announce special additions. Everyone does it differently. But EVERYTHING has a Collectors Edition these days, so I wouldn't even worry about it.
As far as contents go, probably your standard Behind-The-Scenes DVD and art book, in a shiny case. Maybe a figurine of some new creature or important character? Who knows?
I'd expect them to announce something within 3 months before release.