My impression was that this isn't going to be a "reviewed" 1.0-style Wikipedia, but rather a plain old snapshot that's had all the images lacking the correct licencing tags automatically stripped out, and possibly the articles with {{stub}} in them stripped out as well (personally I think stubs should be left in, but IMO it's probably not a major issue either way). The downside of this approach is that it's bound to catch a few articles in a "bad" state, but the upside is that it will actually be possible to do it in the timeframe needed.