As of 3PM PDT (6 PM by WoW Insider's clock) the Scourge are retreating from Kalimdor and the Eastern Kingdoms on most servers, and the Scourge Invasion has come to a close... for now. In each of the capital cities there is still an Argent Dawn Champion handing out their Stamina consumables, as well as Argent Quartermaster so you can spend the last of your Necrotic Runes. The necropoleis, however, are all gone.
I fully expect we'll see something else crop up in the next week, not only because Tigole said so, but because it'd be really weird if the final week leading to Northrend is completely barren. There are also things we know are coming but aren't here yet... but those are spoilers, so we won't go into detail.
If anything happens, we'll make sure you hear about it, so keep an eye out. I doubt anything will happen this evening, but I've been wrong before.