It's to be "re-imagined for the future" according to an Irish retailer by the name of Xtravision, with Nuketown 2025 offered as a pre-order incentive. Treyarch will tease multiplayer in July.
Apparently Nuketown rated as Black Ops most popular map, if you believe retailer ad space. Call of Duty: Black Ops 2 releases on Xbox 360, PS3 and PC November 13th.