In this homebrew would there be other psions wizards or clerics? Druids?

For tier level I would put it at tier 3 ish. The lack of higher level powers is not as troubling for psionics since they can just augment their powers anyway, they still get temporal acceleration etc (I haven't checked your power lists yet so they actually might not >.>)

Just some notes
Psychokinesis' greater conflict sucks pretty badly. Especially since the one directly below it deals more damage than it (even 1 con damage will probably deal more damage than the psion's int modifier)

Also for Psychokinesis their 1st level discipline focus seems a bit weird. Their power for deflecting attacks gives them a bonus to attack rolls? Huh? May be a typo.

Looks like an interesting class.