Re: New Multiplayer Idea For Condtion Zero (make a vote)
I believe I can answer part of your question. The new high-detail weapon and player models will be available in multiplayer, but only to CZ owners. In fact, Ritual is really making sure that the new player models make it easier to distinguish terrorists and counter-terrorists.
There will also be new multiplayer maps (and possibly new modes?). Valve has not (yet) announced plans to make these available to CS players, so we could be looking at some exclusive multiplayer arenas for CZ owners here.