I kind of want the Forsaken to get a city near the Blood Elf and connect those two races more, maybe a small city at the end of the Dead Scar (there's even a big enough Scourge outpost that can be used by them) or maybe in the city that was used by the Scarlet Crusade nearby can also do the trick (the one Arthas DKs destroyed).
The Vulpera are a nomad race, so you can just add some caravans here and there and its done.
The Gnomes just need to finish up retaking Gnomeran and/or connect the small area they conquered with the Mechagnome city
Worgen need to retake Gilneas and then share the city with the Night Elf, to connect those groups a little bit more and at the same time, to be some sort of pay back, as the NE gave them a place to stay and call "home" when they lost Gilneas, maybe the Night Elf can make an outpost near the three where they helped the Worgen with the curse.