I thought it was strange to be able to use greek characters and the like in the code, and then I arrived at the slide about Custom Terms and Operators[0] and... now I think it's an April fool.
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.