I think the issue I have is that it is not really solving anything. It is just using different syntax to do the same thing that can already be done. That was the whole point behind Ruby, someone wanted different syntax for doing the same thing. I fail to see the benefit of trying to make Perl act like Ruby.
I also don't see a huge advantage of autobox just because it distinguish between objects and non-objects and can apply generic method calls. So what; Java does this as well and Java is not any better for it.
I keep thinking of autobox being a lot like Louisiana Creole, French and English mixed together to form something that no one outside of Louisiana can understand it.