The full list of trinkets is behind the break below (and it's quite a list), but I wanted to highlight a couple of them, as they have some fairly unique mechanics. Note that the numbers I cite below are from the heroic versions of the trinkets.
- Stay of Execution In addition to an impressive amount of dodge, this trinket has an on-use effect. "Absorbs up to 29125 damage for 30 sec, but once the absorb expires, you take 20% of the damage absorbed every 3 sec for 12 sec." Assuming you use the entire absorption bubble, that's 5,825 damage every 3 seconds. In most situations, that certainly makes that damage spike much more manageable. Of course, use it at the wrong time and you end up with a DoT ticking away as soon as a boss's enrage kicks in.
- Hungerer In addition to a glob of agility, "When using an ability causes your Energy or Focus to fall below 20% of your maximum, you will gain 1730 haste rating for 15 sec. This cannot occur more often than once per minute." Except in situations where you're pooling Energy or Focus to apply a debuff or interrupt a spell, all classes that can use this trinket bottom out their resources rather frequently. The cooldown will determine the trinket's power and not the actual mechanic of the trinket's proc, but on the surface it seems much more interesting. Time (and theorycrafting) will tell if it actually proves useful, though.