This is currently bugged on live and has been confirmed to be bugged on the current PTR build.

Nightsong Battlegear
4 pieces: Increases the duration of Savage Roar and Survival Instinct by 8 sec.

Savage Roar
Finishing move that increases physical damage done by 30%. Lasts longer per combo point:
1 point : 14 seconds
2 points: 19 seconds
3 points: 24 seconds
4 points: 29 seconds
5 points: 34 seconds


Bug: The set bonus is correctly extending the length of time the buff icon is displayed; however, the effect of Savage Roar only lasts 8 seconds. The buff icon will remain active for the full duration, but the 30% damage increase disappears after 8 seconds. The 4 piece bonus is not working correctly and is actually nerfing dps instead of buffing it.

Here are some screenshots

Before roar: http://i290.photobucket.com/albums/ll271/Dantross/WoWScrnShot_042509_004321.jpg

Roar first applied: http://i290.photobucket.com/albums/ll271/Dantross/WoWScrnShot_042509_004330.jpg

Buff on, but no affect: http://i290.photobucket.com/albums/ll271/Dantross/WoWScrnShot_042509_004335.jpg

You can notice on the addon in the lower left that shows the first auto crits are around for 400, then they go up to 600s with Savage Roar active, then back down to 400 with the Savage Roar buff still showing.

This has been confirmed/reproduced by several druids in the thread on this in the Bug Forums.
http://forums.worldofwarcraft.com/thread.html?topicId=16474162735&sid=1


Posting here since it is still an issue on PTR.