For launch
When Heroes of the Storm launches next week, Blizzard will be offering up a 25% XP boost event that will run from 12:01AM PST on June 2 until 11:59PM PST on June 9. It’s not a whole lot on its own, but it will seemingly stack with a friend boost and a Stimpack.
XP in turn rewards you with different rewards at specific level milestones, from in-game gold currency to gametype unlocks (like the two ranked queues). Characters also have their own individual levels, which will earn you gold as well as the ability to buy a “Master Skin” at level 10.
Expect our review next week after launch.
XP Boost Event [Battle.net]