Following up on some chat in the discord, it looks like WoD on-use trinkets are giving the full +61 in bgs. I was able to farm up the +mastery, +crit and +haste trinkets and got +61 for all according to the character sheet both while I was naked and when I was wearing my feral gear. (I didn't get the +versatilty trinket to drop but I imagine it behaves the same) @Chops mentioned he has a suspicion that there might be some strange scaling diminishing returns, but I wasn't able to replicate that in my testing. Methodology: Jump into a BG and then equip only the trinket I want to test. Pop it and check character sheet. I also took screen shots while wearing my feral gear both before trinket pop and after. I've only tested on my feral druid, but I don't know why this would be different for other classes. Conclusion: For classes that want a big on-use trinket, these look really good.