No it doesn't!
There is no monitor I know of that connects directly to a mini-DVI plug. So you must have some sort of dongle/converter cable anyway.
And whether that's mini-DVI -> DVI or miniDisplayPort -> DVI makes no difference!
'Switchers' must buy either cable. And both are about the same price.
So there is no point in providing both 'mini' connectors.
While I agree that it doesn't make sense to include both types, I don't think Apple is that greedy to skimp a $5 adapter from the new Mini, so I think they'll include at least one so the buyer doesn't have to buy one.