I think Irishman is right. They're only going to put it in theaters for a week or so just to make it eligible for the Oscars. DeNiro said in a recent interview that it would run longer in theaters. Maybe just wishful thinking on his part.

I don't think the de-aging is going to be that extreme. Probably going to make those guys look 50 instead of looking 80, even though these characters will be in their 30s and 40s in the flashback scenes. Movies have older actors play younger people all of the time. Pesci was nearly 50 when he played Tommy DeSimone, who was 28 when he "disappeared".