Hi Daniel,
I think part of the confusion might be that the Datastore Provisioning Wizard is a feature of RCU. We've been getting that a lot lately, so I don't think it will be long before we clear it up.
The reason I bring this up is because you configure which volumes to create new datastores in, from the RCU plugin screen (the NetApp logo in the toolbar). The Datastore Provisioning Wizard allows you to create new luns in the volumes you've specified. At this time, neither the RCU or the VSC assist in creating volumes to store luns in. Again, this is something we're looking at changing because of customer feedback.
Here are a few videos (on youtube)that might help:
Configure RCU
Provision iSCSI VMFS based Datastore
I hope this helps,
-Eric