what if the eighth movie turns out to have something about Humphrey's past?

I doubt it but anything's possible, I guess.

That would be good because it be about time they gave us one of the hundred things we need in the movie

That would be awesome and a brilliant sposta from the creators. They have pretty much avoided the subject in all of the sequels, so if this is the last movie, they better reveal his past o at least mostra his parents.

Nah. Considering how Splash and Lionsgate don't seem to care about further developing their characters I don't see it happening.