October Presentation this friday, source
andriasang.com
Nintendo page, for stream. The whole thing start on the 21/OCT/2011 at 20:00 JST, that would be 11:00 UTC or @500 .beats
It is a prerecorded show dealing with things that couldn't be talked about, during the September event. At the moment, only information about the November firmware and Mario Kart 7 are known to be part of the show.
IIRC, the november update will bring 3D movie shooting, and an updated eshop and couple of other things.