Lol, when I beat it my first reaction was "Well that was fun... I don't know about $40 fun but enjoyable" First started playing it because I thought the "Officer gives suppression -6%" bulletin might be useful with the new MG42 but then I realized that it was the DLC company. -.- Though I was looking forward to getting the Able Company skins which I find quite snazzy.
Anyway, I assume there aren't any conditions for getting the rewards just beating the Campaign? If not then I assume no free skins but at least it was still fun to play it for free since I probably wasn't ever going to fork over the money to buy it haha
If i remember rightly you get more rewards depending on the medal / score (Gold / Silver / Bronze I think) and you get rewards (at least for skins) based on which companys are still alive at the end.