Not much has come from the RnR3 teaser site, other than a wallpaper it's very, blah.
However, the site has received an update, sort of: Sound! Yes, each click leads you to various beeps and bloops. How cool is that?
According to PRC reader, "Freddy" a hidden wallpaper can be unlocked by clicking every square inch on the main page. Doing so will lead you to a hidden wallpaper described to portray Rockman striking a pose behind a large looming foe.
I'm too lazy to try this out, so give a holler if you find something nice.