Tyrande will be given for free till the end of the year
On Reddit, Mike Donais confirmed that they plan to give out Tyrande Whisperwind out for free
We are still planning on giving it away free this year.
Originally Tyrande was given out for free for Twitch Prime users. We don’t know yet how players will receive the hero for free. They haven’t talked about a possible compensation for players already owning the skin.