New world is not planned for Classic, since the amount of New World content available for the pre-renewal build we have is extremely small.
I think you underestimate the amount of content that the 'small' new world area delivers, especially in relation to some key end game pre-renewal items, such as nidhoggur's shadow garb and bradium shield. Personally, I don't consider 6 field maps, 2 dungeon maps, a quest instance, and an end game MvP a small amount of content.
If the actual concern is a lack of room in the database for custom monsters (as I believe the new world monsters are currently being used) I think there has to be better places to find room for monsters. Consider perhaps some of the ghost (no drop/exp) mobs summoned by MvPs, which I believe have their own monster ID. Nobody is going to go farm turtle general's mob, or white ladies mob, or evil snake lord, or lord of dead anymore, and just using regular monsters for the summoned mobs of some mvps could free up a lot of space for custom monsters.
Not implementing the last of pre-renewal's actual content would, in my opinion, be quite disappointing.
Edited by Tolrin, 18 November 2014 - 02:34 PM.