Apparently Disney is breaking the tradition of every Marvel film in the MCU having a scene at the end of the credits. According to Joss Whedon nothing could top the 'shawarma scene' from the first Avengers film, which to me both Bucky and even Howard the Duck kicked shawarma's butt. At least in toughs scenes we got additional information from them. Bucky is hunting for answers, and Adam Warlock had broken free.
But Weadon said in an interview Entertainment Weekly, "We all came at it separately—we don’t want to chase that, [shawarma scene] was a jewel and a weird little quirk".
Marvel Studios head Kevin Feigie says "There will be a tag, But there’s not a post-post-credit scene." A tag scene is a small scene in the credits. Think the way 2008's Incredible Hulk ended. After Bruce is about to 'Hulk Out' the music for the credits play, but instead we get General Ross and Tony Stark in a bar. Then after the credits finished rolling, there was nothing but black. Or using a more recent and more popular Marvel Film, we'll have the Baby Groot scene, but not the Howard the Duck.
Whedon went on to say
“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[eep]! I’ll kill them!’”
So I guess the only reason to watch the credits of 'Age of Ulton' is if you like listening to the music that plays in them, or want to see who worked on it.