I agree. In addition to expanding the continent a bit, I hope they add entire new zones to Uldah, Gridania, and La Nocea. I would even love to see the existing zones in those areas expanded upon with new high level content, and the ability to fly or swim, instead of only creating a brand new city state thing and leave the older zones in the dust. It might be nice to new "flying" zones above Uldah and rest, where flying straight down will transfer you to the old zone instead of hitting an invisible wall like Sea of Clouds.

Imagine chilling in the Drowning Wench, heading outside and mounting your Griffon, and flying straight to the Floating City of Nym with nary a loading screen in sight! 4.0 could be an opportunity for the dev team to really remake the early zones how they want to, instead of what they were forced to do because of the 1.0 design and server limitations.