It looks like the XS-1 will be available from the end of February 2012 with 2/3 sensor like the X10. Main features are that it's a whole lot bigger than the X10 with a massive zoom from 24-624mm. Initial pre-order prices in the UK are from £699 down to £629,
Hands on pre-view from the Fuji-Guys at: http://www.youtube.com/watch?v=Cq2tUftH-pY
It is essentially a very well built bridge camera with the typical X series build quality and if image quality is anything near as good as the X10 it will sell!
I have always had a soft spot for the 2/3 sensor having experience of both the Leica D2 and Panasonic LC-1. This new Fuji XS-1 addresses just about every item on the D2 wish list when it was eventually discontinued! Neither Leica or Panasonic took up the challenge, probably because 4/3 sensor cameras were already in development.