Heres a statement from their website wavearts.com :
We are pleased to announce the release of our entire plug-in lineup in Avid’s AAX format!
All plug-ins will support AAX Native while TrackPlug, MultiDynamics and FinalPlug will also run in DSP mode.
Demos and purchases are now available, see our Downloads and Store pages for more information, as well as updated Product pages. Our AAX plug-in licenses and demos are handled via iLok.
An official press release will follow soon, in the meantime feel free to contact us at firstname.lastname@example.org with any questions about the new format or upgrade options.