I'll start by listing mine:
Last week, 8/8 dungeons on Hunter, got the agi and int trinkets.
Last week, 4/8 dungeons on Shaman, got the str trinket.
This week, 8/8 dungeons on Hunter, no trinkets.
This week, 8/8 dungeons on Shaman, no trinkets.
This week, 8/8 dungeons on Paladin, heal trinket.
So far, I've done 36 dungeons, and 150 boss kills, and have four trinkets. That's 1/37.5. Which gives a drop rate of 2.67%.
However, I do feel like the trinkets were dropping more last week than this week. Not just for me, but for my friends and the random people in the runs. I have nothing to prove that other than my own experience, but I do feel like they nerfed the rate already (perhaps it was too high of a chance earlier?).
In any case, I hope next week I'll be able to get the last one and be done with it.
Now that my life story is over, how many trinkets have you gotten, and if you remember how many dungeons/bosses did you have to do for that many?