tl;dr: Typst 0.15.0 adds variable font support, MathML-based equations in HTML export, multi-file "bundle" export, multiple bibliographies per document, spot colors, and a new file path type. Breaking changes include stricter HTML paragraph grouping, revised baseline handling for boxes/blocks/lists, removal of previously deprecated elements (path, pattern, pdf.embed), and trimming of "Variable"/"VF" suffixes from font family names. A new `within` selector, `divider` element, and `typst eval` CLI subcommand (replacing `typst query`) round out the release, along with fixes for list marker alignment and CJK justification.