Well, a big part of how strong the new polymorph spells will be is how natural attacks will work in 2nd ed. Without full-attack-actions how many attack’s do they get per round? From the glasscanon podcast it looked like one per action, atleast the skeleton they fought got one claw attack for one action. If so does it even matter how many different natural attacks you have?
Would there even be a difference if your form has one bite or 20 arms with claws? If you don’t get more attacks then why should you even use natural attacks when normal weapons are so much easier to enchant or pierce DR with.
And what about pounce, pretty much the strongest ability polymorph spells give you? Does it even exist in 2nd ed? At this point in time we know pretty much nothing, nevermind how polymorph spells will work.