In this Friday, June 29, 2012 file photo, specialists Frank Masello, left, and John T. O'Hara work on the trading floor of the New York Stock Exchange in New York shortly before the closing bell. U.S. stock futures are rising tentatively on optimism about recently announced measures in Europe to stave off a debt crisis and hopes that interest rates there will be cut this week, yet gains are being tempered with more evidence of a broader slowdown in China.