Нашел ссылку, ключи для ЕУ-региона.
FREE EU BETA KEYS
BETA KEY #1
PEHDJW-D4C9-BP9T7V-XJ47-MFX4F7
BETA KEY #2
JBKH28-RKRK-YKR7YR-X4NC-WBPJTT
BETA KEY #3
DG7K66-C96F-BHKEGF-W8EE-4FBR2G
These keys only work for European Battle.net Accounts.,Heroes of the Storm,Игры,beta key