What is new in Exchange 2010 Service Pack 2
… read the article on TechNet here
You will find some very useful features now implemented. Read carefully about Mailbox Replication Service, as it will support you now on your way to Office365 more seamless.
Also the Hybrid Configuration Manager will support you on local and Office365 Exchange Organizations.
For those who hosting Exchange 2010, now additional features available with SP2 which have been missing for long time. Follow the link for the Exchange 2010 SP2 hosting guidance document.