Interesting. I also note that the Dragon Magazine Annual 2009 comes out that month as well. I was under the impression that the Dungeon Magazine Annual would be coming out earlier, but I can't find it on the list. (Fine with me, though, since I'm more interested in the Dragon Annual anyway.On WotC's product page, the DMG2 is listed, no cover or blurg, however.
Minion creation rules.
Rules on governing and maintaining kingdoms, baronies etc.
Rules for large and small scale warfare.
Trap building.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.