I agree, the 2.0 world is still totally relevant, but there's no real reason that a new 1-15 zone couldn't be added. After all, *ALL* of the starter-areas have place that immediately jump up to higher-level mobs, so the same could easily apply to a new area around Ishgard.

Or, perhaps a better idea, have the starter area based around a small settlement on the outskirts of Ishgard. The Au Ra are clearly a *TOTALLY* new race to Eorzea, and although they might arrive at any of the existing cities as regular ol' adventurers, it also makes sense that they might found a new settlement, to teach the Jobs that they bring alongside them. Dark Knights, for example... I just can't see them setting up shop in any of the existing cities, but as Yoshi-P has indicated new players will be able to start the new Jobs right away, too, I feel like that would make sense.

Plus, it would give you just a taste of what Ishgard has to offer, before sending you back to 2.0 content to get leveled-up from 15-50, and at that point, it would all be brand-new content for new players.