(WSJ) - Today marks the beginning of the Bordeaux “Primeurs” week, one of the most important dates in the wine-tasting calendar and the most important for Bordeaux, the world’s largest fine-wine region. Over the next five days, more than 5,000 wine connoisseurs—critics, commercial buyers, négociants and sommeliers—from as far afield as Tokyo and Shanghai descend on the region to taste the 2011 vintage.