This might have been mentioned before but there's an area in southern Tiragarde Sound called
The Rusted Vault, where there's a lot of unfinished texture work that looks like new Gnomish architecture, which we haven't seen in a LONG time. There's a couple of quests with it, related to how the entire Gnomish population of Boralus just upped and vanished (!!) and the Gnome questgiver believes they might have gone here but everything is sealed off. You take some readings and he says the findings will get sent to Ironforge for analysis and that's it.
Entire Gnomish population of Boralus just goes missing? Any ideas?