Well, I think he's in a different situation than most people asking this question. Most people are dithering because they want to time the market and score a win.
I'm guessing that
@Ridan actually needs a new MBP sometime in the next 12 months and is wondering if currency fluctuations might make the next MBP release dramatically more expensive regardless of whether there are comparable performance increases.
The usual wisdom of "buy it if you need it" is less seaworthy in the OP's case, but absent any killer insight into how the currency rates might respond perhaps the best anyone can advise is...
Buy it if you need it. Otherwise, wait.