A recent firmware update to Apple’s HomePod shows that accessibility support has been added to the operating system, and that includes VoiceOver. The device is voice activated, but it does have a touch surface that allows the user to long press Siri and adjust the volume. With VoiceOver included, this touch surface will be accessible to the visually impaired.
For now, the device does not support third parties or extensions, but that could change before the release of the HomePod in December.
Source.