Who is responsible for future CJK characters?
The development and extension of the CJK characters is being done by the Ideographic Rapporteur Group (IRG), which includes official representatives of China, Hong Kong (SAR), Macao (SAR), Singapore, Japan, South Korea, North Korea, Taiwan and Vietnam, plus a representative from the Unicode consortium. For more information, see the IRG home page. The IRG is very carefully cataloging, reviewing, and assessing CJK characters for inclusion into the standard. The only real limitation on the number of CJK characters in the standard is the ability of this group to process them, because the characters are increasingly obscure (no person — living or deceased — knows more than a fraction of the set already encoded).