However these phrases when used alone can mean something different.
I'll get mine. - is usually said by someone who vows that he will get his share of something. He says this to someone who has said he might not get his share.
You'll get yours - [note: I added will] This is usually a threat made against someone who has cheated you. You are threatening that you will get even with him someday or at the very least that eventually that someone will make him pay somehow if he continues to do this bad thing.
We'll all get wealthy. - ahhhhh....we all can only hope this will happen.