you probably already do this, but I'd start doing things like getting him dressed and undressed in his room, put his name on the door etc and also talk about it being his room. if he has books before bed I'd put a chair in there and start reading to him in his room.
I think once the bed arrives it's up to you how you want to handle it and how best you think he'll respond eg I know with my ds there is no point trying to force him into something and we need to be patient while he adjusts to something new.
good luck - I hope he loves his new bed, it looks great!
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