Retention policies for Microsoft Teams

Stuart Mcbain , you misunderstand my question. I'm aware that Private Channels are available. I'm asking when retention will be available for Private Channels. Per the documentation, current retention policies on Teams Channels do not support Private Channels. https://docs.microsoft.com/en-us/microsoftteams/retention-policies - It's the first purple note on the page: 

We don’t yet support configuration for retention of private channel messages. Retention of files shared in private channels is supported.

Thankfully Private Channels rolled out in a disabled state to our tenant - maybe this was intentional by Microsoft. Where a tenant has retention policies applied to Team Channels, the Private Channels feature was deployed in a disabled state. 

Until retention policies support Private Channels, we're stuck and I'm trying to find an ETA on this functionality. The roadmap has no mention of it, sadly, and I'm not finding anything anywhere else. A support ticket only reiterated the documentation available and they couldn't say whether it was ever going to be available.