The Unicode Consortium has posted a new issue for public review and comment.
UTS #37, Unicode Ideographic Variation Database, is being updated to broaden the scope of base character, from characters with the Unified_Ideograph property to characters with the Ideographic property, excluding characters that canonically or compatibly decompose. The substantive changes can be found in Section 2, Description. This proposed update is currently under review with a closing date of 2017-01-16. For more information, please see Public Review Issue #337.