To my knowledge, you only lose such abilities if they are based on your natural form. Most class abilities function independently of form however, so I think you keep them.
The curse is intended to be pretty much impossible to bypass.
Revelations should only be prevented from working if they are form-dependent, as Ravingdork stated. What constitutes "form-dependent" is largely a matter of table variation, but most oracle revelations ought to be fine.
Edit: Using the examples in the polymorph subschool text, I could see a reasonable argument for not allowing "pierce the veil", as it's in line with the listed examples of form-dependent abilities ("keen senses, scent, and darkvision"). However, I would still not call it form-dependent since the ability is granted by a class feature rather than something inherent to the race--the list examples assume that the abilities in question are inherent to the creature's form rather than granted by its class or some other non-form-specific ability. Your mileage my vary.
it depends on if it's based on your physical form or not. Also you're able to activate shape changing after you've changed, like a sorcerer growing claws.