By Irene Klotz WALLOPS ISLAND, Virginia (Reuters) - An unmanned Antares rocket, developed by Orbital Sciences Corp. was poised for launch from Virginia on Wednesday to send a new cargo capsule to the International Space Station. Liftoff from the Mid-Atlantic Regional Spaceport on Wallops Island was scheduled for 10:50 a.m. (1450 GMT). Meteorologists expected a 75 percent chance the weather would be suitable for launch. The Antares rocket and Cygnus capsule were developed in partnership with NASA, which committed $288 million to the program. The U.S. ...