Firaxis have unveiled an XCOM 2 [official site] stat-tracking page that shows how many soldiers have died, how many aliens have been killed and other such details. Four and a half million XCOM soldiers dead in less than a week since launch. Good work, Commanders. Five percent of those soldiers met their end at the hands and teeth of a zombie. Really great work, Commanders, seriously. You are nailing it. The stats page currently tells me that none of you have managed to complete the game but that is, apparently, an error.