THE YEAR OF THE HUNT HAS BEGUN!
Pre-story to the Year of the Hunt:
The continuing story following the event of the Year of the Dragon continues with the city of Dalaran chasing down the lost crimnal who escaped the Violet Hold. After Khadgar and the rest of the Mages of Dalaran took back their city, they've been flying around Azeroth looking for those said criminals, which lead them to Gadgetzan. During their attempts to capture the escaped hooligans across town, Noggenfogger asks for help to remove the Dalaran problem by blowing their home with a custom Mana Bomb crafted by Kazakus. Their efforts were foiled however when Noggenfogger got cocky and invited Khadgar to taunt him. He slipped and Khadgar got the lucky break of it. Now Noggenfogger is on the run and the criminals of Gadgetzan have now begun to disband in the aftermath of their gangs being busted by Archmages who were close to being blown-up. Now Gadgetzan is a new business central in Azeroth and has changed it's city to be more "honest working."
Gadgetzan's Streets:
After the events of Dalaran dismantling the gangs, many of the classes broke into new factions of business to keep themselves afloat, though many of them have pining of old times. In this expansion, Triclass cards return, only each Triclass has a newbie on the block and need to catch up to the other's talents if they wanna move up in the world. This appears in the new Keyword of the Expansion, Learning:

In this expansion, each Triclass has a single class learning the type of tribe the classes specialize in. Rogues are learning the dangerous and majestic natures of Dragons from Priests and Warriors, Paladins are learning about the wonderous creations of Elementals from Mages and Shamans, and Warlocks are finally treating their Beasts friendlier with the help of Druids and Hunters. Each Learning Class has a single Learn card (Beginner Cards) that can be put into decks that can generate cards of that type from theirs and other classes to help out. Here's an Example: [Hearthstone Card (Beginner Infuser) Not Found] is a card that encourages Paladin to play with their healing ways, but encourages you to build a way to synergize with more than just a few Elementals. Each Learn card in the Learning Class will have the class colors in the corner so you can always know what classes you are taking from.

Now to show one of the Triclasses and their cards. How exciting!
Elemining Mineral Co.
On the edge of town, recent Meteor falls caught the attention of 3 Boomsday experts that wanted to study the rare elements found there, as well as in the underground waterways that the meteors exposed underneath the sands. Kangor and Luna both sought out the rare powers of these elements (Though Kangor had very little experience with Elemental power), causing them to connect with the wonderful Elementals that exist in the Company. Seeing Elementals would be a great help with the business, they offered a co-ownership with Electra to help out with the Underground Rapids. After a year of work, the three took in a child with natural gifts of working with Elementals and decided to make her their successor, creating the Elemining Coal Co. Kangor still struggles to learn about the power of Elementals and their forms and continues to learn from his partners the wondrous creations they have seen and known.
Mage Class Cards: (Theme: Elemental Chaining, Spell Damage Combos, Elemental Control)
Shaman Class Cards: (Theme: Elemental Board Presence, Spells, and Repeating)
Paladin Class Cards: (Theme: Elemental Chaining, Board Buffing, Secret Strength, Healing Helpers)
If you guys want to see the rest of the triclasses, feel free to comment below in the Forum. If this doesn't get much notice, I don't free time have to spend 2 hours straight from my day taking every card in the expansion and writing full on explanations for each Triclass. If this Forum gets enough views, I'll post the next Triclass as well as the Neutrals probably next week. If that continues to do well, I'll finished with the Last Triclass and the Triclass Legendaries. If all goes well, I'll post teh Solo Adventure content into my final post. Please comment and leave notes on cards that you think need tweeking or cards you really like so far too! Please tell me what I can do better!