A new toy reward was datamined for the A Greedy Emissary Diablo-themed event coming in 10.1. The new toy is a devilish banner with a uniquely Lilith resemblance, the primary antagonist of Diablo 4.
Diablo Event Rewards Preview Diablo Event Transmog Preview
Nightmare Banner
How exactly we’ll obtain this new toy remains a mystery as the details of the event have not yet been revealed.