I keep looking for the thread to comment on this and didn't see one so started one.
This Beta has it. You have to kill things to learn about them. That is fine and interesting. It is kind of like a free range slayer count. I do like that you are finally getting something for killing those 200 kobolds that assault you. It also could lead to doing some areas you wouldn't otherwise to kill that "rare" type of a mob like a big game hunter.
I find killing 1000 bats of x types an acceptable way to learn everything about them although killing 1000 orthons, tieflings, Lamanian (or Harry's) may take a while.
I would like it if the developers could have a tab that lists just the mobs in the current zone. I don't plan on killing 1000 Fire Elementals in Misery's Peak and Frost Mephits were not listed. But if I am out of combat I would like to be able to review Ogre Magi before I go into Madstone to adjust my weapons and spells. Also an alphabetic vs Class as a lookup or maybe even a level sorter if you are looking for Earth Elementals for your soul stones.