In an interview with EW, Director Joss Whedon confirmed there won’t be any special shawarma scene after the credits.
“We all came at it separately—we don’t want to chase that,” Whedon says. “That was a jewel and a weird little quirk. It didn’t seem to lend itself in the same way, and we wanted to be true to what felt right. The first rule of making a sequel is take the best moments and do something else. Don’t do the Indiana Jones gun trick again differently. Just go somewhere else. Don’t try to hit the same highs, because people will sense it.”
“There is nothing at the very end. And that’s not a fake-out. We want people to know so they don’t sit there for 10 minutes and then go: ‘Son of a b#$%! I’ll kill them!’”
“There will be a tag. That is, there will be a short, epilogue-like scene that pops up shortly after the credits start. But there’s not a post-post-credit scene.”