Preordered on 2012-07-02 through the 'business' route and was given a estimated delivery date of W/C 2012-09-03.
Email this AM says it's shipped today. Two weeks and a day lead time. I don't want to read too much into that, but there has to be at least some suggestion there that the 5 weeks on the web page is a conservative estimate.
I know of another one ordered via the consumer route (ORPxxx number) one day later on the 3rd July, so it'll be interesting to find out when that one ships.
BTW, I'm in the UK, so I wouldn't read too much into this for anyone not in the UK either.
Oh, and nothing on the one ordered from RS on the 1st July which said 'dispatch within 12 weeks'...