The Macbook Pro line of products is getting a bit outdated since the last refresh was April 2010 (unibody). Apple is known to be refreshing its product every 1 year and the macbook pro will not be an exemption.
Image from 9to5mac.com
One great evidence that a new macbook pro is coming is due to the dummy SKU shown on Best Buy's inventory system. Another would be the depleting stock of the product (supplies are becoming short because the manufacturer is not shipping new products anymore). If you're going to launch a new set of product, its only logical to clear up your inventory from the old one to give space for the new one .
Image taken from 9to5mac.com
The images above suggests a $1,200 price that will be released on March 2011. Remember that this could change anytime since its just a placeholder record.