It's basically a more playable version of the UA generic expert class with some minor spellcasting thrown in as an option. Or maybe a bard with less spells and no singing.
You can pick up either arcane or divine spells (you choose) up through 3rd level spells (via feats) and there are additional feats that reduce arcane spell failure by percentage points. There are also leadership related and weapon focus type feats.
It's an ala carte version of the bard and rogue. You can pick and chose what stuff you want. So you can be an arcane caster (limited to 6th level spells), cast in light armor, get evasion, sneak attack, etc., but not have to play the fiddle or do stand up comedy.
There's a limited spell list that depends on your character's outlook.