Apple opened up HomePod to third party services this summer, through an official SDK. A lot of people are jumping to conclusions based on the lack of a screenshot.

Spotify has been pretty slow to pick up new features (iOS widgets, watchOS app, etc).

Yeah, Spotify's pattern has generally been:

1. Demand some integration point on appleOS to be opened up

2. Drag their feet on using it once Apple makes it available

3. Roll said integration out almost silently when they finally implement it