At this point it looks like the A350 may make an aerial appearance, but not actually visiting the show. I interpret this as a potential flyby of some sort. It is of course their priority to continue with the flight testing at this point.
I have heard mixed statements on the CS series. Some seem to think they will make an appearance & others don't. I cannot comment on that. There is definitely a chance of the A350 making some sort of appearance though. Toulouse is only an hour down from here.