Diablo in Duels -for a limited time?

According to the latest update, Diablo will be available in both Battlegrounds and Duels starting November 2nd, as part of an event.

They say his appearance in Battlegrounds is limited to the event’s duration, but what about Duels?
I just think it would be cool if they started adding more heroes to this mode.

I hope i wont be let down but it sounds like fun, really hope they didnt oversell it and its meh