I can definately see them keeping all the housemates in the lounge this time around because it would be far too easy for the housemates to hear whats going on just the other side of the door, however by doing this the housemates could/would click that something is definately going on and know that its not a real eviction taking place, we will just have to wait and see, its going to be good to watch thats for sure.
As for the garden situation my guess would be that they let them in the garden at certain times just so they don't end up hearing each other shout things out, again this way the housemates will still KNOW that something is going on.
Roll on Friday now and lets just hope its Aisleyne who everyone votes for.