I keep wanting to post in this thread, but haven't entirely figured out what to say.
Basically, I hated 3e psionics. Hated it a lot. Didn't like the mechanics, which seemed to me to be a cobbled together spell point system that created as many problems as it solved, and didn't like the flavor, which wrecked what types of psions it did model while failing to model many of the classic types of psions at all.
The 9 schools of wizardry did this a bit too, of course.
Anyways, wizards look to be getting fixed. Wizards look like they won't be as broad and bland, but will instead focus and have detail in their specializations. I want to see the same with psionics.
When I think "psion," I think telepathy, telekinesis, mental control, and maybe pyrokineticism. I think of a character floating six inches off the ground in a crumbling citadel, throwing pieces of dilapidated architecture around with his mind.
Less pseudo wizard, more x-men.
I don't mind crystals, if they're kept within reason. I don't mind bald guys with tatooed heads, if they're kept within reason.
On the mechanical end, I'd prefer, but do not demand, a system by which the psion uses his own energy to power his abilities. I want him to be tired after using his powers in combat. I want fighting beyond his normal limits to be possible, and to leave him with an enormous migraine. You get the idea.