This was discussed as being needed since January in the Product Team meetings.
On February 11th, @dbhurley shared a first draft which outlined a proposed release schedule based on what had been discussed in earlier meetings and the features that had been talked about/in progress (e.g. the Marketplace, email builder) and others that were suggestions which could be included.
Here’s a link to the meeting notes on Slack and here’s a link on the forums. Here is the Trello task, and this post is the forum thread that we suggested should be set up for discussion.