This passes automatically to the surviving joint owner (or owners) on the death of the first dying joint owner — it does not form part of the estate of the first person dying.
Your superannuation arrangements may not entitle you to dispose of your superannuation assets by your will. The rules differ from scheme to scheme — you should discuss the matter with the administrators of your superannuation fund.
Proceeds of life insurance policies
If the owner of the policy has nominated a beneficiary of the policy, the nomination takes precedence over the terms of the will. It follows that, where a nomination is made, the proceeds of the policy do not form part of the estate.