As the headline says, the Yankees ranked 5th, jumping 17 spots from the 2010 rank of 22nd. The rest of the top five were Kansas City (1), Tampa Bay (2), Atlanta (3) and Toronto (4).
BA lists Jesus Montero, Gary Sanchez, Manny Banuelo, Dellin Betances and Andrew Brackman (the obvious choices) as the Yankees "Impact Talent". The article also calls Montero and Sanchez "the two best catching prospects in the baseball."
New York climbed higher in our rankings from 2010-11 than any organization, not so much because it added new talent but more because many of its prospects had breakout years.