Sure, the Germans had to know we would invade sometime. Especially with the build up of troops in the UK. But for us to openingly talk about it and even announce who the commander is going to be is just too much information. The more we talk about it, the Germans would have to know the closer it is getting to be. TMI
The Germans will use this readily available information to deduce that General Patton will be leading the main offensive at Pas de Calais.