This isn't really a playtest thread, since there are no action points in the Beta rules.
But...
There are some flaws in the 3.5/Pathfinder rules that could be conveniently solved with action points.
For example, the raging debate about fighters and their susceptibility to SoD spells.
Fixing fighters' will saves, or giving them class abilities to shrug off enchantment type spells, seems to overpower the class.
Wrecking the SoD spells to allow fighters to survive them just ends up writing those spells off as broken and unworthy of use in game play.
The middle ground solution may be to drop in an action point system. If everyone had a few "Get out of jail free" cards to play each level, the fighters will be able to resist a few of those SoD spells, mages might not die every time someone pings them with an arrow, etc.
The beauty of it is, with just a simple set of A.P. rules, every class will have many, most, or all of their concerns fixed at once, while game balance is preserved.
So, if it's not too late, I would like to suggest an A.P. system, even if it's just a sidebar in the rulebook.
Action Points are an optional system listed in Unearthed Arcana, also available online here.