Guys from the DPM team issued small Excel tool which allows to receive instant overview of steps required to upgrade your current DPM infrastructure.
The tool covers questions of upgrading from DPM 2007 RTM to 2010 RTM (pre-release) installed on various OSs and in diverse configurations. According to the utility, by the way, we’ll be able to upgrade to the RTM from the release candidate. However that doesn’t mean that DPM 2010 RC is supported. =)