Lots of activity from blue posters in the forums as of late, might be more signs of a coming 3.0 PTR. Most active the past couple days is Jeff Kaplan himself (aka Tigole). Here are a few of the highlights:
We can’t fly in Dalaran, is this a bug?

Tigole

For the time being, it is intended [...]

He didn’t answer much, but did say that 3.0 will be on the PTR’s soon!

Tigole

None of the classes are done. They are still being iterated on. 3.0 will be on the PTR’s soon. There is still a lot of testing before 3.0 would go live to public servers.

If you look back at past patches, [...]

We saw this with The Burning Crusade, 2.0 was released about a month and a half before the actual release of the expansion. Just as expected, it’s gonna happen again! Soon! Early November release date anyone?

Eyonix

With the release of Wrath of the Lich King approaching, we wanted to provide you with some important information. [...]

Long title, but it really says it all. Ghostcrawler posted about raid stacking changes (which are huge) and mentioned a new Death Knight group strength and agility buff. You can hit our forums for more indepth discussion!

Ghostcrawler

As we’ve suggested a few times, we are currently taking a serious look at all of the various [...]

Okay I can’t comfirm level 80 is coming, but it seems obvious. Plus I like the word imminent…

Gradinad

We will be taking down the Beta realms at 2:30PM Pacific time today August 21th 2008 to update to the latest build.
We expect this process to take from six to eight hours.
Thank you for your [...]