We probably have to update a few things, like we did with Unicode 6 in Bug 25708 and r9889.
There is a question on VP/T about this:
U+03F3 has a new uppercase introduced U+037F.
" the software will recognize that these two page titles are case equivalents, which means that they can't be technically distinguished from each ther. Will the software somehow automatically resolve this conflict by removing or forgetting about one of the two pages; will it remain accessible; or should it be deleted first?"