According to 9to5mac, a small Macbook Pro refresh is incoming. New model numbers for all the Macbook Pros have hit Apple's internal inventory system according to their sources.

MD311 – 17 inchMD313 – 13 inchMD314 – 13 inchMD318 – 15 inchMD322 – 15 inch

The changes are expected to be minimal. They will most likely be a small processor bump and possibly integration with Bluetooth 4.0.

If you are on the market for a new Macbook Pro, I would hold off just a little while longer before purchasing.