In short, the base benefits of polymorph spells (which Beast Shape is) are described in the magic chapter and include natural attacks.
However, this is something that I feel is a major issue. I'm running a PF game with a pc druid and in order to manage wild shape we had to check through about six different locations* to get the whole picture of how wild shape works. This information
needs to be compiled.
I started work on this myself. I'll post the base of what we've put together and I hope that it will help make your job easier.
Basics
Action: Standard action; no AoO.
Duration: 1 hour per druid level.
Abilities:
Disguise +20 to pass as the animal.
Other abilities as granted by the spell up to the form's maximum ability.
Attacks: Natural attacks of the form modified by character's BAB, Str & Dex
Size change: Modifiers applied to AC, attack, CMB, and Stealth skill
Gear: Melds into body; constant bonus that don't need activation still count (excluding armor).
Large Creatures
+4 Str, -2 Dex, +4 natural armor
-1 AC & attack, +1 CMB, and -4 Stealth
Medium Creatures
+2 Str, +2 natural armor
Small Creatures
+2 Dex, +1 natural armor
+1 AC & attack, -1 CMB, and +4 Stealth
Tiny Creatures
+4 Dex, -2 Str, +1 natural armor
+2 AC & attack, -2 CMB, and +8 Stealth
Reach: 0 feet
*
PF Wild Shape sources:
Druid wild shape, pg.25-26
Transmutation/Polymorph explanation, pg. 159-160
Size modifiers, pg. 150, 160
Beast Shape spells, pg. 202-203
Elemental Body spells, pg. 224-225
Specific animals: Dire Animal & Animal sections,
MM (and wherever animals are detailed)
+ I'm sure I missed a couple of spots