From Pro Tools Expert on the coming release of Pro Tools 2019:
https://www.pro-tools-expert.com/home-p ... s-and-more

- Midi Tracks doubled to 1024
 
- Increased number of voices for Ultimate, but only as paid extras for software-only.  Voice Packs will be available to buy or rent in blocks of 128 voices.  HDX users will go up from 256 to 384 per card.
EDIT - Avid have subsequently clarified that all users will have the voice increase from 256 to 384 voices with no extra charge 
- Add plug-ins, change loop duration, and make other timeline and track changes, without Pro Tools stopping and breaking your creative flow.
 
- EUCON enhancements for iPad control of EUCON monitoring, and adding Scroll to Track and Scroll into view protocols.
 
No word yet on release date.