Erm, I have always had that icon... well it was under photos and under videos.  I think I had to "Search for media servers" or something like that before it got my PC.  Do you remember doing that for fun or something? Regardless, I'll check to see if this new icon is on mine as well.  If I see nothing different, or if I described what yours basically is, then whatever... maybe your PS3 is a test subject of Sony :)