Reported by a member over at our forums, who asked me to post a thread on his behalf, AdWords Getting Large: 4 Lines. Let me say that this is coming from someone I trust and the image is not doctor'ed up. It may be a test or it may be a bug. But it is for sure large. It occurred on a search for california weather.
Forum discussion at Search Engine Roundtable Forums.
Update: Gary Price added a postscript to Danny's link to us on this topic saying;
A Google spokesperson has confirmed that Google is currently conducting a "limited test" of longer ads.A test! That deserves some forum discussion! How could they!