Yes the reverser was locked out on when the aircraft returned. So no it could not be used on the next flight. It is not that an unusual occurance to lock out a reverser. Depending on the weather at the departure and/or dstination the fault may have to be fixed first though or the aircraft swapped to another one. I believe there was a small delay to a flight yesterday due to a reverser fault that had to be fixed due to weather in New York.