This list incorporates things that we plan to work on, not things that we’ve already done. When it comes to calendar layout, you will see that it’s on the roadmap with ‘Calendar Upgrade’s because it already exists and we’re making improvements to it. Timeline layout is on the next cycle.
Internally, we had the discussion about Gantt as being pretty easy to implement if we already have timeline layout in place. However, we decided not to put it up on the public roadmap because we had not yet decided if that’s the highest priority layout to focus on after timeline. It could be stream/feed layout. But indeed, Gantt layout is part of the outline because we know it’d be helpful for folks.