As there is different level of integration customers can use I just can point out what to concider. Too I dont see in your post wich DB and Version your are using.
MSSQL - do you work with a db user or windows authentication? If windows authentication is used you have to concider the rights in mssql.
AE:
- Windows Authentication used to start the CP, WP, JCP, JWP or Windows Agents - you have to concider to chage it too on day of migration
- LDAP, LDAP SSL, (SSO): If integration is used for login or single sign on you have to concider that your LDAP and domain is changing
- Login Objects Agent: Also here changes might be considered if Servers where Agents are running are moved to another domain.
- Jobs: in some cases it could be that you start a program (Windows, Linux) where you hand over on command line host name or users & with an Domain (AD). Also this is something you should check upfront.