I got an email notice from Symantec that VCS Data Protection Administrator for UNIX using NetBackup 5.0 certification will expire on 12/31/08. It will soon be replaced with the NetBackup 6.5 exam (DP-065W for Windows and DP-065X for Unix)
See more details here:
Although it does not mention the other NetBackup certifications (design, implementation, etc.), I assume they will be replaced with the NBU 6.5 program soon.