Blizzard games are often distinct from one another -- you're not going to confuse Hearthstone with StarCraft, for example -- but they are not conceived and executed in vacuum, and there is influence between each.
If you've only been playing World of Warcraft for the past few years, you might well be pretty used to the way the current talent system works, where you have three talents per tier and can choose one of the three, and gain a new talent tier every so often (in most cases, every 15 levels or so until you hit level 90, and then a last tier at level 100).
There are a lot of characters on the Heroes of the Storm roster.
Update: This was originally posted just for our supporters, but now it's available for everyone.
As part of the 8.0 patch, some of the powers of the various legendary items we've been collecting all expansion have been added as talents and abilities to the various classes and specs that have been making use of them.
If you play a DPS Warrior, especially Fury spec, then it's been a crazy month and Blizzard isn't done with the changes.
In Warlords of Draenor, Blizzard began what they called "ability pruning." For better or worse, the developers decided that classes just had too many buttons to press.
If you've been paying attention to the Battle for Azeroth alpha, you may have noticed that certain abilities that exist in Legion as Artifact Traits or effects on Legendary items are being baked into classes or talent trees.
If you've been playing WoW for a while, you're familiar with the way each class sees design changes with the coming of a new expansion.
Legion will be here in just a few short hours, and if you're jumping back into the game this week, you'll find your class is all new.