HOF in XPath/XSLT 2.1?

I'm looking at implementation of XQuery 1.1 higher-order functions,
and specifically inline functions, in Saxon 9.2. I'm wondering if that
addition is strictly for XQuery, or if it will be also present in
XPath 2.1 (and therefore indirectly, by extension, XSLT 2.1), and
whether XSLT 2.1 will provide any similar facilities, such as local
<xsl:function> declarations, or perhaps even unnamed <xsl:function>
expressions?