Update: Blizzard has offered further clarity with a couple additional posts, linked below. Using existing trinkets as an example, the emphasis is that tank trinkets should provide a similar amount of offensive value to Tank players, while also providing a defensive benefit, but tank trinkets should not be as strong as DPS trinkets for damage dealers.
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Blizzard on Tank and Healer Trinket Change Philosophy in The War Within
Blizzard has posted a clarification on the philosophy behind the Tank and Healer trinket change.