Not that it bothers me very often, but I can also confirm this surprising
behaviour; creating new HTML as well as XHTML file uses "default.html" 
File: New: HTML/ XHTML works the same as the dropdown list of the New icon.

The newly created files contain in both cases the text of default.html and has
the name like NewX.html, however the statusbar contains the correct information
about the syntax (HTML or XHTML).

The only working way to get a new XHTML file seems to be 
File: New: Use template: XHTML: Default
this way an empty NewX.xhtml file is created and filled with default.xhtml.

vbr

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