You know what I hope is on the way for 2.1 that they've been keeping hush hush?

New zones. Specifically, Beast Tribe zones, since that would tie in perfectly with the Beast Tribe daily quests and Extreme Primals (if they're "Walk up to this crystal and Duty Finder from now on", I'll gut somebody...). If you look across from Natalan, you can see a whole settlement and just north of Natalan is actually a gate with a path leading there. There are two gates in a blocked off section of Zahar'ak, one leading to that giant tower they have set up. U'Ghamaro is a bit harder, there are plenty of closed of sections in the mines which could lead somewhere, however nothing really screams out "This will lead to another zone in the future" like the others do...

I doubt they have anything so surprising lined up for 2.1 though... Still, we'll see them someday... There are plenty of other such zones too, a Volcano is meant to be near Outer La Noscea (this zone line was on concept art for the zone and is just to the left as you zone in from Upper La Noscea, currently its some Nym ruins). The path to Ala Mhigo is already apparent in East Shroud at the eastern most point, with Imperial debris blocking the path currently, you can even see an imposing Imperial barricade. Griffins Crossing in Coerthas should eventually lead to Coerthas Eastern Lowlands (the Ixal seem to have taken Eastern Highlands), and Coerthas Western Highlands is currently frozen over while we wait for Shiva, Central Lowlands seems to have been completely removed from the game though, but they could always just add it back in as a step between Central Highlands and Mor Dhona. I'm sure there are plenty of others I've missed/forgotten about.