To answer your question simply:
No the IT Policy will not be transferred over to the 8300. IT policies are for devices that are currently on a BES and can only be pushed from one. Since the 8300 isnt activated yet, you wont have any problems. All your 3rd party apps will transfer over and all you'll have to do is EA.
Note: There is a function within Switch Device Wizard that will detect that the 8300 is not currently Enterprise Activated and will ask if you would like to activate it. Just decline this and your golden