For a while there I was confused on whether this was an April fools prank or not. Which certainly does justice to Perl.
http://iaindunning.com/blog/julia-unicode.html (note: 2 years old)
We have been doing that for AGES. Not just in languages like APL, but even in Javascript, Go and tons more...
It does require some mechanism to input Unicode if that's what you want to do but that wil be true for any language -- it's nothing to do with Perl 6.