Nervousness characteristic of a session encompassing the Fed decision is palpable, with the trading in the major U.S. index futures pointing to a slightly lower opening on Wednesday. Among the global markets, Asian stocks closed mostly lower, while the mood across the Atlantic is also jittery amid the release of some mostly positive domestic earnings. Commodities are seeing weakness even as the dollar trades mostly higher. Apart from earnings from companies, including Baidu (BIDU), Humana (HUM), Mastercard (MA) and Starwood Hotels (HOT), the domestic markets may also focus on a key reading on first quarter GDP growth and pending home sales. Nevertheless, the FOMC announcement could have the final say in how the markets move about in the session.