Actually, it will be more correct to say that the additional gigabit ethernet port could be used for high speed periphials i.e. cameras etc. However, I don't know how they would get power, but I'm sure sony would figure something out. But gigabit ethernet ports for a camera would be great.
Other than that, I say it will be more or less for a basic hub, that way it would be much easier to connect multiple PS3's together via ethernet rather than a hub/router.