Things are getting more interesting with this PS3 Slim rumour. The German Amazon.com site featuring the listing now has a picture of it, and it looks a lot like rumoured PS3 Slim sightings from before.
Again, same caveat applies. Retailer listings of unannounced products should always be considered suspect, no matter how much everyone's talking about them or sending them around.
PlayStation 3 Konsole slim [Amazon.de, thanks Will P., s m, others]