My initial thoughts:
-It's still essentially a full spellcasting class, with Psionic Mastery essentially being the ability to cast 6th level and above spells.
-The Potent Psionics feature is essentially both types of the equivalent Cleric domain abilities that add either wisdom to cantrips or bonus damage to weapon attacks.
-Awakened Mind's ability is only once per long rest, while many other orders get a lot more usage. I feel they should they get the ability to break up it's 10 minute usage, or have a short duration for 1/short rest instead.
-Nomad's Memory of One Thousand Steps, seems like it only works on attack rolls that hit the Nomad, from it's description I feel that it should trigger on any damaging effect such as a fireball.
-It's interesting they put the Wu Jen in the Mystic, as it was always a class that was sort of half-wizard/half-druid in many ways.
-Soulknives at level 14 are always going to use Phantom Knife and the bonus damage from Potent Psionics will be added, from what I read.
-From previous editions the orders are based on Ardent/Divine Mind, Telepath/Seer, Nomad, Battlemind/Psychic Warrior/Egotist, Soul Knife and Wu Jen.
-Mantle of Command, is quite a lot of what the Warlord did. I think it was designed just to piss off Warlord fans...