The Christmas Slot Contest is a good example that Wolf.bet team have plans to make surprise for Wolf.bet users and so much more, with very good rewards.
Christmas slots contest isn't officially announced by wolfbet team. I think that efialtis has taken the first step to run this contest. Anyway, someone has mentioned above that wolfbet sending bonuses to their loyal (VIP) players. I don't know how they are making the distribution, but it would be better to run a promo which will attract new players too.
I expect that Wolf.bet will cooperate with more game providers and bring more to Wolf.bet.
They have a small collection of slots providers, but they have good collection of the games. I found some slots game on the site which aren't available at most other casino.