Avengers is on track for $68M+ today. That's insane. Taking out the midnight sneaks from Friday's $80M gross, it actually improved on Saturday. Unheard of. Word of mouth must be sick.
So it's probably going to be like this: $80M Friday (incl. Thursday midnights) and $70M Saturday.
To give you a comparison, the last Potter did $91M on Friday (incl. Thursday midnight) and fell to $43M Saturday.