I get the feeling we'll have 2 post-credits. First one is Cap's new Avengers team, guessing it'll be comprised of characters we've already seen - Falcon, SW, WM, Hawkeye, BW, and Vision. The 2nd post-credit would then tease new characters, take your pick from any of the Phase 3ers. From a marketing standpoint, having a tease for Ant-Man seems to make the most sense as that film could probably use all the marketing help it can get. Would be nice to see Marvel having cast the actress for Captain Marvel though, a titular female hero on the MCU slate is long overdue.