If a bit of rain in a queue is enough to put someone off they are mad, or perhaps right to drop out at this stage to give a chance to someone else. This is England so there is every chance it would rain on the big night, as far as I know the stadium doesn't have a roof (though correct me if I am wrong, I thought it only covers spectators) so I would consider rain while queueing for rehearsals to be a rehearsal in itself! The sensible thing to do would be to take an umbrella, warm clothing etc. It's April and it is still cold, no one likes standing in the rain but that's life I suppose. I've been caught in a downpour a few times these last couple of weeks, but cursed no one but myself for being unprepared.
My two pence, is that casting know full well what they are doing and the shows will be spectacular. If there is no news for people, then there is no news. It sucks to be waiting though, I feel the frustration. It's inevitable that some people are going to be left disappointed, and it will come to a point for some that they will have to decide whether waiting/taking part outweighs the benefits of throwing in the towel - no one can make that decision apart from the individual. If anyone is not happy, or cannot commit, they are free to move on and free up a place in the queue for someone who is still free and does still want it. At the end of the day we volunteered knowing that there would be a big commitment at some point, and knowing that we could either take it or leave it at any stage, so they don't owe us anything really (quicker communication would be nice! But sometimes there just is no news to give...).
Here is hoping everyone will be put out of their misery soon though...