It doesn't work like that unfortunately.
Journalists (or whatever they are) are invited with promotional purpose, but if they decide to give them a preview, and forbid any recording is for a reason. Since you are invited into that room and have the priviledge and the benefit to watch the gameplay exclusively it should be on your duty to respect the company request and rules. You can damage the company very hard if you don't respect the rules. It's called professionality. And those who liked to call themselves "professionist" or "journalist" should know the meaning of it.
Taking part to a gamescon also have a sense as pr and promotional. Would be stupid not to take part to it, with the game closed to be released (released in less than one year, it's closed). Plus you need to feed the audience in a way or another, it's public relations as I said above. You just have to have patience and respect their schedule. I'm saying to those so called journalists, not to you-fans.
When you worked for Disney and you are invited to a preview, or to a course specifical for one work in progress movie, you are forced to sign the non disclosure agreement. Disney is very nitpicking in this. Everything you do with the material you receive and watch is at your own risk. Company espionage is a serious thing. I know many Disney artists punished by the company cause they dared to work on parallel projects for different companies, but on the same topic and target. Such as:
May sounds ridiculous but it's how it works. It's a cruel world.
