I have not read it really far, but many things disturb me:
-first, the role. No role ? No, it's not in the 4E spirit. If you want to do multiple roles, do multiple classes...
-second, it's really hard to read. Please, do something to distinguish at-will from encounter or daily powers

-third, as it has already been said, many powers are utility powers, and not attack powers. Utility powers give you various bonuses, and attack powers damage or otherwise inflict a condition to at least one ennemy.
-fourth, some keywords are missing.
-fifth, I would think that it would be great to make implements for all psions and all powers. If psions have no implements, they will suffer at high levels where implements are important. Maybe tatoos, dorje or crowns, so you can keep the Orb implement feat that is quite a good idea.
-sixth, paragon paths usually have an ability at 11th level that improves action points. The other ability is gained at 16th level and not at 20th level.
-seventh, I like the stances, I think it fits the psion very well.
-eighth, make a difference between Success, and Effect. Success are the effects that apply on a successful attack roll, Effect are effects that do not depend on the success or failure of an attack roll.
-ninth, great job, all what I said before is just to improve the quality of your work
