Blizzard announces that all new players who log in to Heroes of the Storm over the next week will receive a free Stimpack to double the XP and gold they get during their introduction to the game. They offer a couple of stipulations, indicating this is a valid way for players to get a leg up on competing in a new region:

• Players will only receive this Stimpack if they have never logged in to Heroes of the Storm, and they must log in at least once during the hours mentioned above.
• Players can log in to another region and receive a free Stimpack if they have never played in that region before.