It seems disingenuous to me that the prices jumped up right on the eve of pre-orders being available. I'm incredulous about the whole exchange rate argument, when you're talking about a company buying significant amounts of stock. The contracts for such purchases would have already been signed, and would have modelled in the exchange rate prevailing at the time.
That, and the whole "better get in quick because exchange rates might get worse!" stuff is classic salesmanship. It'll work with a lot of people though, because FOMO.
At the end of the day though OCUK can do what it wants, supply and demand, etc, and you have to have been living under a rock if you think this is somehow a new phenomenon.