I wasn't going to, but I didn't resist and read that anyway.
spoilers:end of spoilers
We know a teenage Cassie Lang is rumored to appear in the movie. If that turns out to be true, maybe we get a glimpse of the Young Avengers in the future, which would fit with Kate coming to the MCU as well. That's the only scenario in which I can see Hulkling appearing in this movie. But him hitting on Bruce Banner, though? That's just weird to me, specially if Billy is also there, which I would think he would be if we were getting a YA glimpse with the OG team. It'd make more sense if it was a scene with the two boys commenting on how hot the Avengers guys are or something like that.
Does anyone have a link to where this spoiler/leak came from? I'm genuinely curious now.