When hovering over an ability, the tooltip will tell you whether or not that attack is weak or strong against certain pet types. Additionally, you can hover over the opposing team's pets and view their attacks during combat. This will be important since it’s a good idea to pit a pet that's strong against the opponent's pet who's vulnerable to that type. 

Kaivax, a WoW forum community manager, revealed that WoW Classic's class design, battleground mechanics and stats on existing items will be set to their 1.12 state, despite the game releasing content that expands beyond that. This removes "progressive itemization," so if the stats on a specific piece of equipment was changed during the original updates, that won't take effect in this version.

Nov 13 What are the differences between versions? I just have a trial at the moment but i'm confused on what each version offers. Normal Sub : $15 a month Battle for Azeroth: $50 (needs subscription) Complete Colelction: $60 As far as i knew if you had a subscription to the game you get all of the content minus the latest expansion. So let me see if this is right. If i were to get the complete collection i would get one month at a $5 discount and the newest expansion OR Just pay $15 For the game and all expansions EXCEPT BFA?Buresh2 Nov 13
This is something that people really need to start to understand, not just for Classic or WoW but software developement in general. Fixing a bug isn't just flipping a switch or changing a single digit. You have a machine with literally hundreds of thousands of parts, designed by dozens of different people at different times over the course of 20 and more years. You change a single thing and it might break 50 other things in very subtle ways that might not even emerge until months later (i.e. the very high M+ keys some players got at the start of BfA).