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Not sure what a MCB is, but if you mean a 13" Mac Book Pro I would definitely wait until WWDC in mid June.
 
It should be no-brainer, right? But I ma usually VERY skeptical with anything new. I do not update my iOS as soon as it comes out, as I am worried about all the bugs it may have... I like the "true and tried". I guess this should not be a concern of mine when purchasing a new Macbook Pro?
 
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