Yes, there will be major price changes because Apple tells people on forums everything about their future business plans. Competetiton? Bleh, who cares if we let Dell and HP know what we're up to, they won't care.
Sorry for the sarcasm Honestly Apple is one of those companies that is very hard to discern where they're going next. I bought my MBP back in April and earlier this month they reduced the price. But one thing you can depend on is Apple not changing the specs much throughout the year. The MBP in it's current form should hold for a year or so but the price may change. If you absolutely don't need it right now, then just wait until the end of June or beginning of July to get one. I believe in August there's a developers conference, so there might be a product announcement then.