Google has just pushed out their June update to the 3D buildings layer. Some cities with updates include Chicago, Christchurch (New Zealand), Karachi, Rome, Barcelona, Amsterdam and Moscow.
In addition, there is a big bug in this update. There is a building in western Turkey that looks like a normal house but is about 11 miles wide! You can view it here, but hurry — Google will likely fix it soon.
Google Earth Blog has the rest of the details about this update.
I want Google Earth to be like Virtual Earth but, with extra 3D Buildings all over the world. Every city in every contindent. I want it to look real, and current.