Another interesting improvement that will be included with Exchange 2010 SP2 is the new Hybrid Configuration Wizard. This new wizard has been designed to make the configuration necessary in order to establish coexistence between an Exchange on-premise deployment and Office 365 (Exchange online) much simpler for the Exchange administrator.
With Exchange 2010 RTM/SP1, you have to go through a lot of steps to set this up coexistence but with the new wizard it can be done in just a few steps.
Technology Architect/Writer/MS Vendor
MCM: Exchange 2007 | MVP: Exchange Architecture