It's in today's New York Times, a short story in the Bits section about a Congressman who did it. Here's the link.
If you think about it, Jeopardy's a much easier game. It's a question and answer with a 1-to-1 mapping of question to answer. If IBM didn't waste all those millions, they got really close to having 100% of the answers in the database. The hard part might have been some of the word associations to find some answers and real world knowledge to avoid bad answers. In any sports, there's no way to predict what the opponent will do strategically, nor how to discern the moods of the players and the coaches, or deal with slips and errors. How is this coaching Watson figure out who was hung over or sore from too much sex? Or who was madder than hell that day? How is all the data about the way a basketball bounces going to help?
There's an interesting take on how this new item was sort of buried in the newspaper here.