Arbortext 7.0 includes support for DITA 1.3—no plugins or additional modules required.
With the release of Arbortext 7.0, all DITA 1.x documents are supported by the Arbortext suite of products. Arbortext has had support for DITA since 2004, when it was originally being designed by IBM.
Although DITA 1.3 Draft Specification went out for Public Commentary in July and has not yet been finalized, PTC/Arbortext, who participates on the OASIS DITA Technical Committee, has already updated Arbortext to support the changes to DITA as outlined in the latest draft DITA 1.3 specification.
What's in DITA 1.3 that you might want?
MathML and SVG support. Scoped keys. DITAVAL filtering to support sets of conditions. Cross-deliverable linking. New Troubleshooting topic type. Enhancements to the Learning and Training document types. Just to name a few!
Arbortext will be updated in a future maintenance release once the DITA 1.3 specification has been finalized.