It is pretty unlikely that “trusted testers” of any product could actually be loitering around 4chan. But Phandroid writes of one “Android trusted tester” on 4chan who haas revealed screenshots of the soon to be launched Android 2.2 Froyo that could possibly include automatic app upgrades.
Faking such a stunt is not exactly hard. Photoshoppers do it all the time by creating elaborate photoshopped screens and opening the images on the handset of choice to make it look like it actually is real. Nevertheless, as Phandroid notes, an automatic app upgrade feature is very likely to be implemented as it has been awaited since version 1.5