When you have your cluster just add the Role and select DHCP server. Just for the Demo I turned off the second node. Just make sure that you have installed the Windows Role DHCP on both nodes. this is not the cluster Role.
The Cluster Overview As you can see the DHCP resource is running on node 1 and in the lower screen you can see the DHCP cluster configuration. Disk , IP, Name. and If you want to change this, this is the place to do this.
If you want to manage the DHCP server just do manage in the Cluster View
Now that I have turned on the second node I can do a failover. Eh but you did not configure anything on this node Except installing the Windows DHCP role.
Yes but as it is a cluster the configuration moves to the other node.
A nice new feature of windows server 8.