Describe changes for #1523 (HTML/XHTML refactoring)
Describe changes for #1524 (DITAVAL for print filtering)
Describe changes for #1548 (RFC 5147 in coderef)
Describe changes for #1561 (Chunked topics in full list)
Describe changes for #1569 (Create Index w/ FOP)
Describe changes for #1601 (Single-topic PDFs)
Describe changes for #1602 (Add/remove plugins via CLI)
Describe changes for #1608 (Wrap SVGs in <img>)
Describe changes for #1612 (Update Ant to 1.9.2)
Describe changes for #1614 (Don't require fop/lib)
Describe changes for #1616 (Remove legacy PDF)
Describe changes for #1509 (Remove integrator.properties)
Promote DITA 1.3 related changes to dedicated section

TODO: Add extended description to Release Highlights
Describe changes for #1644 (Add more HTML entities)
Describe changes for #1643 (Use "/" path separator)
Describe changes for #1631 (Process keyrefs before conrefs)
Describe changes for #1673 (Remove support for generate.copy.outer=2)
Describe changes for #1671 (Support back cover for PDFs)