Wizards has updated the playtest document for the 5e Mystic class. Take a look at it here.
- The class now goes to 10th level. The core concepts had enough support that we feel confident moving forward with them.
- Psionics is more flexible. You have a psychic focus, which allows you to pick one discipline and gain a constant, special benefit from it. Otherwise, you can expend points to use any discipline you know.
- Psionics now includes psionic talents, the equivalent of a spellcasters cantrips.
- Psionic disciplines are now available to all mystics, regardless of mystic order. However, your order grants you a benefit for using its associated disciplines.