No the NFS IPspace isn't routed, it is a physically isolated network.
I created the IPspace because i thought, make the best separation to the rest. Ths customer has a worldwide MPLS routed network and when someone at the other end of the world don't think at the NFS IP address network and he used it also we got problems when accessing the CIFS shares from this site.
For me is the NFS network separated like a FC SAN.
I think at the moment i can only attach a new portgroup the the VMware VSwitch which has the NFS VMkernel Ports and add a additional NIC to the VCenter server to access the NFS SVM.
Perhaps in the future it will be possible to create a management interface for a SVM in a different IPspace. I think there are some cases where this can be useful.