Stan Lee has already filmed his next four cameos in Marvel Studios films, according to Coming Soon. Kevin Feige said Lee flew into their production studio recently in Atlanta to film his cameos:

“We do not shoot random ones. They’re always very specific...A couple of months ago in Atlanta, he flew down and we shot four in one day — for four various projects. They’re all awesome! They’re all totally different. And he was unbelievable. He was on fire. He came in, he sat here, he stood there, he stood in this window, and then he went home.”

No word as to what Lee filmed, but I would imagine he's already done his appearance for Doctor Strange. What four movies do you think he's already filmed his cameo for?