I've read in James Fenelon's Four Hours of Fury that Life magazine reporter/journalist Robert Capa was briefed and allowed to jump in Varsity. hH was to jump right behind the colonel commanding the 513 PIR. Considering military secrecy, how much of a briefing would he get?
Depends on his parent "command". If he's reporting for, say, Stars & Stripes, he would get a briefing appropriate to his rank before hand. If he was in a position where he could be captured he would have gotten less information. In any case he would have a chance to interview pivotal people, and it would up to them to say nothing they weren't allowed to speak on to the press. New York Times reporters, or others with that level of "pull" might get more, but only if their dispatches were cleared before being forwarded to the agency involved.