Whoa. You're making 1 assumption which is way out. Wildshape is not
based on polymorph, its based on the Alternate Shape
ability. And if you use the SRD, they aren't vague at all, so long as you follow a few links.
- The creature retains the type and subtype of its original form. (If the new form has the aquatic subtype, the creature gains that subtype as well.)
- It gains the size of its new form.
- The creature loses the natural weapons, natural armor, and movement modes of its original form, as well as any extraordinary special attacks of its original form not derived from class levels (such as the barbarianís rage class feature).
- The creature gains the natural weapons, natural armor, movement modes, and extraordinary special attacks of its new form.
- The creature retains the special qualities of its original form. It does not gain any special qualities of its new form.
- The creature retains the spell-like abilities and supernatural attacks of its old form (except for breath weapons and gaze attacks). It does not gain the spell-like abilities or attacks of its new form.
- And this is the key one:
The creature gains the physical ability scores (Str, Dex, Con) of its new form. It retains the mental ability scores (Int, Wis, Cha) of its original form. Apply any changed physical ability score modifiers in all appropriate areas with one exception: the creature retains the hit points of its original form despite any change to its Constitution.
- The creature retains its hit points and save bonuses, although its save modifiers may change due to a change in ability scores.
- Except as described elsewhere, the creature retains all other game statistics of its original form, including (but not necessarily limited to) HD, hit points, skill ranks, feats, base attack bonus, and base save bonuses.
- The creature retains any spellcasting ability it had in its original form, although it must be able to speak intelligibly to cast spells with verbal components and it must have humanlike hands to cast spells with somatic components.
- The creature is effectively camouflaged as a creature of its new form, and it gains a +10 bonus on Disguise checks if it uses this ability to create a disguise.
- Any gear worn or carried by the creature that canít be worn or carried in its new form instead falls to the ground in its space. If the creature changes size, any gear it wears or carries that can be worn or carried in its new form changes size to match the new size. (Nonhumanoid-shaped creatures canít wear armor designed for humanoid-shaped creatures, and vice versa.) Gear returns to normal size if dropped.
Which means that if you change into a bear, you're as strong, fast & tough as a bear, but as smart, wise & charismatic as your normal form.
So all that means (I'll work with a bear for the example):
HP stays the same.
AC recalculates, not necessarily to the AC of the monster (although it is likely that it will be the AC of the creature, just need to factor in stuff like Wild Armour & certain feats)
Str, Dex & Con become the same as your new form.
BAB stays the same, TAB recalcs.
You gain the bear's claws & bite, and the Ex abilities of the creature (not Su or Sp), so a bear gives you Improved Grab.
For healing, it says "Each time you wildshape", so only when you become the animal do you heal, as changing back doesn't cost you a wildshape use.
You lose the ability to speak.
The only real difference is that Alternate form means you drop gear, where wildshape melds it into your body.