Another day, another Apple rumor. According to 9to5mac, Apple will likely unveil refreshed MacBooks during this year's WWDC Keynote address on June 10. Leaked codes seem to indicate that a refresh is likely. Also adding fuel to the fire, inventory for current MacBooks is reportedly constrained.
MD711LL/A - Better - USA
MD712LL/A - Best - USA
MD760LL/A - Better - USA
MD761LL/A - Best - USA
These numbers would correspond with refreshed models with two different screen sizes. The "better" and "best" would correspond to different configurations within the screen size. It's somewhat likely that Apple will debut refreshed MacBooks at WWDC, however, this is just a rumor for now. But I would place this rumor towards the "likely" end of the spectrum.