Info about Black Ops Map Pack 2 has been outed by GAME Australia. VG247 report that a flyer appeared on GAME Australia’s website but has since been pulled.
Release data was 3rd May 2011, with 4 maps (a zoo, a hotel, a convoy, and a stockpile) as well as a ‘Call of the Dead’ zombie map.
Edit: Now confirmed at the official Call Of Duty site.