Battle for Azeroth takes a lot of its inspiration from the first World of Warcraft WoTLK Gold games, which has brought a renewed focus on the Alliance vs. Horde conflict. It will take players to new areas where the two factions will compete for military resources which they can use on their Islands, Zandalar (Horde) and Kul Tiras (Alliance), when they finish new quests and advance in the narrative.
World of Warcraft : Battle For Azeroth - Warrior And Monk Gameplay
The expansion also includes 10 dungeons and new Raid zones, and World of Warcraft quests. There's also a new mode known as Warfronts which is a co-op mode with 20 players designed to be akin to classic RTS games. The goal is to build massive forces, then attack objectives and deal with enemies commanders.
As for your character's level, the limit rises to 120. and the purchase of the expansion will grant you a level 110 boost for use with your new or existing toon. Also, new playable races for allied races. Alliance is given the Lightforged Draenei as well as Void Elves The other race is Horde. Horde is given Highmountain Tauren as well as Nightborne.
Blizzard has also announced that along with it's standard as well as cheap WoTLK Gold editions, it will release a Collector's edition that will be available for Battle of Azeroth. It will come with an audiobook, novella in hardcover as well as more.