Installation was trouble-free. I brought up the menu and selected the '39 campaign, colonel difficulty. A question for the future: when the DLC is released, will it be available from the current menu like the original campaigns are?
I played through the Poznan scenario. Won a DV in 13 turns. I really like having the secondary objective attached (capture 3 airfields), as this gives the scenario a more historical feel as well as providing an additional challenge. (I wonder, if you don't manage to capture the airfields, are there consequences in later scenarios -- i.e., the Poles have more air power?) The scenario is a good opening to the campaign -- a decent challenge but not too difficult. Only one thing on the map seemed wrong: one of the Polish-held cities at the start of the game is Wroclaw. Wroclaw is in modern-day Poland; however, at the beginning of WW2 it was in Germany (called Breslau). Otherwise everything seems in order.
I moved onto the Danzig Corridor scenario next. Alas, I had to go to work so I was unable to get past the deployment screen. However, I did notice two typos in the briefing:
1. Near the beginning of the second paragraph, the word "it" should be inserted as follows: "...advance into Poland, it is vital..."
2. In the next sentence, remove the comma between the words "rail crossings."
I plan on setting aside as much time as possible this weekend to get in as many games as possible. At this point all I can say is that the new campaign looks great and I am very eager to get into it as far as I can. (And also, thanks to the development team for including me in the beta test. It is an honor and privilege to test out the new content for PzC.
Looking forward to getting more playtime this weekend.

