Are you aware of the Unicode Technical Report (TR) being prepared by the C committee? See http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1040.pdf
While there is no guarantee, it is a definite possibility that the C++ committee will use this C TR as part of Unicode support in C++. Because this TR is so limited in scope (it just has a few conversion functions), that probably won't cause problems for a C++ Unicode library, but you should still be aware of the data types introduced.
No, I was not aware of that. Thanks for the link. There doesn't seem to be any problems associated with a possible unicode library, and that C library being included into the C++ standard. It basically does a lot of the low-level unicode stuff that I am currently doing by hand, so it would probably be more of a blessing than a curse if it got included into standard C++.