LNBs with the SatCR chip should be appearing soon. (I think there is one available now). These will allow up to eight receivers to connect to the LNB through a single cable. Multiple band-pass filtering is used, each receiver being assigned one band-pass frequency range.
Several receivers already have the 'Unicable' software needed, presumably existing receivers can be software updated.

PDF's explaining the system can be found here -

h**p://www.st.com/stonline/books/ascii/docs/10465.htm

Llew