No matter what new race they add, it'd be nice (in my opinion) if you could create a new character of that race and pick up at the latest expansion.

[Brainstorm incoming]
Maybe you could only play a certain new class and you would start in the new zone. Maybe other characters wanting to pick up that class would be taught by the native (whatever race), but that rave could choose it at character creation. Maybe they could start out at a lower level than 70 and have a different "intro" to the overall game and expansion than the character who you leveled originally to get there.
It could be a feature available to players who have completed all the MSQ on a character already up to that point.

All I know is it would add to the immersion (instead of going through 2.0 as the new race and having no one react to that, much like with Au Ra), and avoid all the catching up going through the MSQ again. It would also be alt-friendly for players with distinct characters in mind.

I doubt they would ever do this, but I would love it if they did.