This thread is going to compile links to all of the Alpha and Alpha 2 documents currently released, as well as give status updates of upcoming Alpha releases.

Psionic Races Alpha 2

Base Classes
Psion
Psychic Warrior - Beta available
Soulknife Alpha 2 - Beta available
Wilder

Psionic Powers
Powers Overview - In Progress
Psion / Wilder / Discipline Powers
1st Level Powers
2nd Level
3rd Level
4th Level - Not Started
5th Level - Not Started
6th Level - Not Started
7th Level - Not Started
8th Level - Not Started
9th Level - Not Started

Psychic Warrior Powers - Started

Psionic Feats

Psionic Skills

Prestige Classes
Cerebremancer
Elocater
Metamind
Phrenic Slayer
Psion Uncarnate
Pyrokineticist
Thrallherd
War Mind

Psionic Items - In progress

Psionic Monsters - In progress

I'm curious as to why the Psy War went from Alpha to Beta, while something like the SK went from Alpha to Alpha II

Well... there's no really quick answer. The psionic races went to Alpha 2, as well.

I'd say part of it is that the PsyWar Alpha to PsyWar Beta was a pretty hefty revision. Major changes to the entire class structure. The soulknife alpha 1 to alpha 2 had a lot of changes, but still was very similar in overall theme. The beta of the soulknife will also have very hefty changes from the Alpha version based on player feedback.

Can´t wait to see that one