what are the community challenges so far, if any? are there plans to include additional community challenges? If so, when is the next one? do you obtain a reward upon completing a community challenge, similar to ribbons?
You get a community challenge ribbon, hypothetically. Simply put, above where all the normal ribbons are displayed is small medal with a counter showing how many community challenges you have completed.
The challenges do change. I completed 3, one was where all weapons only did 1/3 damage. IE, it takes 3 times as many bullets to kill a german.
Another was where you had to complete a day without using any upgrades or promoting a soldier.
I forget the last one. The community challenges got bugged and Urb has been notified, I assume a fix is in the works.