XP Potions: The Elixir of Rapid Mind and Elixir of Ancient Knowledge no longer drop. They can be bought on the AH still but are way to expensive for it to be worth it. The Excess Potion of Accelerated learning is available from your garrison quartermaster but only works for level 91 to 99. As of Patch 8.1 you can also buy the 10% XP Potion Draught of Ten Lands.
What can you find in our WoW guide? We decided to approach the matter a little differently than usual and instead of preparing a comprehensive guide we focused on major features and key information, tips, and instructions, which may be useful during leveling up and raids. Therefore, instead of providing a detailed walkthrough, we've included answers to important questions, such as how to unlock a mount, how to reach new locations or, most importantly, which allied race you should choose at the beginning? In other words, in following chapters and section you can find everything that will be useful for a beginner player during his adventure with WoW's new expansion.
Good news if you are leveling an alt and you have Draenor Pathfinder so that you can fly in WoD, the next 10 levels will only take a few hours. Personally, I didn’t have this until recently and I went back and got the achievement and I’m glad I did. Now I can level all my future alts fast by just flying and picking up treasures for a couple of hours.
The expansion brings a major change to the PvP ruleset on each realm. Every realm by default only allows players to attack NPCs in the open world; players who wish to engage in world PvP now have a setting called "War Mode" that can only be toggled on or off in their faction's capital city (i.e. Stormwind for the Alliance and Orgrimmar for the Horde). While in War Mode, players have access to new talents and abilities, as well as a slightly accelerated rate of XP gain. Characters with War Mode activated are only able to see other players with War Mode, unless in their own capital cities.
Excess Potion of Accelerated Learning: Acquired in your Garrison (part of the Warlords of Draenor expansion), this gives you a 20-percent bonus to experience from killing monsters and finishing quests. It lasts one hour, but you can buy it multiple times and use it back-to-back. Alliance players buy it from Sergeant Crowler, horde players buy it from Sergeant Grimjaw. Does not work above level 99.