is it possible that the "new" Enterprise is a refit, and there is an older Enterprise that we haven't seen, possibly one that would look and feel like the TOS Enterprise?
I suppose it's possible if the ship that Kirk sees being built on the ground isn't the Enterprise (since that seems more like a building from scratch than a refit). Both of those seem unlikely to me, though, so I'm thinking that he's probably looking at Ent being built as a new vessel.
Even more unlikely when you consider that image of the Enterprise is used on at least one of the international posters...