sandydee -
The ability for NetBackup to use a PureDisk storage pool as a DSU is not yet available. This will be available with the release of PureDisk 6.5 (so NetBackup 6.5 is essentially waiting for this release). Because PureDisk can act as a DSU you will be able to send an Oracle backup to your PureDisk DSU. I can not comment on the effectiveness of dedupe for this type of backup.
If you already have PureDisk, you could backup up Oracle flat files with the PureDisk client and get client-side dedupe (bandwidth reduction), however, your policies would be configured through PureDisk rather than NBU. I know there are customers doing this today.
How to send NetBackup VCB backups to a PureDisk DSU will be clarified around the release of PureDisk 6.5.
Finally, PD 6.5 will be available in the very near future. If you already have PureDisk, contact your sales rep for information that can be shared under an NDA (non-disclosure agreement).
Peter