UPDATE: Mason has upper-body tightness and is 50/50 to start tonights game. He will backup if he doesn't start (Columbus Dispatch)
Although Mason is expected to still start tonight's game he was seen "checking with the Blue Jackets training staff on at least three occasions during practice."
Hitchcock's response to the injury question "We'll see tonight. He'll start and we'll see." Hitch's plan is to start Mason tomorrow night too.
This will be a last minute deal tonight, probably with no more updates until after the pregame warmup which is too late. Dan LaCosta is the other goalie if you wanted to know.