Whilst I don't agree with this 100% I think, as Apple seems to fly in the face of business convention, that it is a real possibility. Apple did not cut UK prices when you got US$2.11 / £1 so it will have profited from that so it could afford to 'lose' on a weaker pound. However it increased prices on introducing the new unibody MBs - a mid-range MBP by £170 (£150 base + £20 cost of video adapter inc in previous version) despite an imminent recession and presumably lower manufacturing costs (the unibody machines have fewer case parts for example). I suppose the only consolation is that Apple raised prices for all their non-US customers so we are not alone. I might be wrong but MacWorld 2009 in Jan is presumably the danger point as prices appear to change with the release of new models - and there are expectations of new models at this event. I have reached the conclusion that there is never a good / bad time to buy a new machine - you buy it when you can afford it AND you need it coincide. The only caveat to that philosophy is that I am waiting for the faulty MBs to work their way through the system.
PC World are already offering the new VAT rate at their stores so if you can't get the new rate at Apple you can take your money elsewhere.