As for as I know, stretch goals will be making a return although I can't specifically tell you what will or won't return, nor when they are expected to come back. On top of that, I can't confirm that the things suggested here will be implemented due to balancing issues but we'll see what we can do.
Now that has been said you're welcome to suggest anything you'd like to see, but keep in mind we can't have things which are too overpowered or impacting on the servers/community.