It's happened before ...
Ooh, didn't know that. When was it?
It's happened before ...
AppleInsider.com said:Apple is gearing up to begin production of its new thinner and lighter MacBook Pros, with production of the new 15-inch model set to begin first in mid-April...
AppleInsider.com said:... Intel plans to release Ivy Bridge chips that are seen as likely candidates for Apple's next-generation Macs at the end of this month. In particular, new quad-core Ivy Bridge processors are expected to officially go on sale April 29.
At the end of the day, with all threads like this, if you have an actual need for the laptop, such as for work or something, then buy it now.
If you don't have any need for one and are waiting for a newer version, then you may as well just keep waiting.