Interesting, finally gave in and called. I only ever had the xko order number and it never made it into any state that was trackable. Turns out my order did not progress because there was a PAC code on my account (a previous aborted attempt to move to Vodafone, who managed to run 10 hard credit searches during the iPhone preorder, but that's a different story). Unfortunately, nothing told me that the order had stalled, and it was actually cancelled a week later, again without telling me.
The agent took the PAC code off and finished the order. The good news is that there are apparently 510 iPhone 512 Pro in Blue in stock right now, so I will get mine tomorrow. Interesting information regarding the stock level too.
My advice to anyone that still just has an xko number - call and ask about it. Looks like not everything that might hold up and eventually cancel an order will actually be communicated - there are some people that had the "give us a ring" message, but I never did - probably because their systems were down when the order was supposed to go through...
