As heard on the Stephanie Miller show this morning, they have announced that AM1090 will flip formats in Janurary. We put in a call to AM 1090 and haven't heard back from programming. We'll update to confirm or deny.
This past Friday, another progressive talker, AM620 KPOJ in Portland suddenly switched to sports talk that same day.
Addendum: Brad Friedman covers this and more on the Peter B Collins show