Here's some info I found on the official website.
Black ops weapons are going to be added to the original four maps (only for hardend and prestige editions)

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"Drop your linen and start your grinnin all you Prestige and Hardened Edition zombie slayers out there. Straight out of World at War and upgraded for Call of Duty: Black Ops, Treyarch brings you the four Zombies maps that brought the zombie apocalypse to the Call of Duty world! Whats the rundown?

For those of you who pick up the Hardened or Prestige Edition, youll receive the original Zombies maps Nacht der ntoten, Verrckt, Shi No Numa, and Der Riese from Call of Duty: World at War and its subsequent DLC map packs. The dev team went the extra mile to upgrade these maps with the amazing graphical and audio improvements that Black Ops brings to the Call of Duty franchise.

And it doesnt stop there.

Dive to prone to avoid those meat-bags deadly swipes. Listen to Tank Dempsey and his band of zombie exterminators rattle off their killer one-liners in Nacht and Verrckt (you may recall, they didnt debut until Shi No Numa). Pop open the Mystery Box for a plethora of wait for it some of the deadliest weapons that Black Ops has to offer! You read that right AK-74us, M-16s, RPKs, Spas shotties and those are just the tip of the iceberg. Now you can roam the asylum, swamp, and factory and fend off those maggot-sack hordes with some serious firepower. Need a little more oomph in the later rounds on Der Riese? Activate the Pack A Punch machine and upgrade your Black Ops weapons into some of the most devastating weapons the Call of Duty franchise has ever produced.

So grab the Hardened or Prestige Edition to add 4 more Zombies maps to the full Black Ops co-op experience. And for those of you who missed out on the original World at War Zombies maps, this is your chance to see what all of the Zombies buzz is about."

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