From a blue.

http://forums.worldofwarcraft.com/th...eNo=1&sid=1#10

We do plan to make improvements for both the Doomguard and Infernal at some point in the future, quite possibly in Wrath of the Lich King.

http://forums.worldofwarcraft.com/th...70806&sid=1#14

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Q u o t e:

Like how? longer durations? Or buffing their damage?

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It's hard to say right now. We'd like for warlocks to have a reason to use them in places that just aren't major cities. :P