Ryu,
JSON is UTF-8 as standard, so should support future internationalisation.
At some point we need to make a decision about if, when and how we support international languages, but I think that needs to be done as it's own individual tranche. We know from our previous conversations that its not a quick add, and that the community has different concerns, so my vote would be that we schedule it as a topic in an upcoming tranche and deal with it then - and release it as part of 2.0.
I think at the moment just getting the basic structures of the objects we need should be our focus.
Cheers
Terry MacDonald