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 alih 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 atau at least tunjuk his parents.

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