I don't know if this was mentioned anywhere but;
http://penguins.nhl.com/club/news.htm?id=668719
So. 8pm start.
NEW YORK (May 1, 2013) – The Chicago Blackhawks will play host to the Pittsburgh Penguins in a regular-season outdoor NHL® game at Soldier Field on Saturday, March 1, 2014, at 8 p.m. ET/7 p.m. CT, the National Hockey League announced today.
http://penguins.nhl.com/club/news.htm?id=668719
So. 8pm start.