On thing I've been missing with most tools (including Plutio that I've heavily invested in) is task dependencies. And one's that can combine with the Gannt chart. Basically when you work with teams often a person is waiting for someone to be able to start his work. To be able to set these dependencies and easily view them and see how they affect the timeline in the Gannt chart.

See how Beesbusy handles Gannt charts and dependencies. https://appsumo.com/beesbusy/ - they have it, but your product looks more well designed and clean.

Is this coming, and if yes when?

Tools like Plutio (also on AppSumo) promised task dependencies years ago but didn't deliver, and without it, it is not good for managing complex projects..