The planning and campaign channels are the features I miss most about ContentCal; I would use them to add things like significant dates, topic ideas, other content's publishing dates, and other campaigns to link into social - basically allowing the calendar to be a complete content planner.

It would be great to have the ability to add users and state their account privileges e.g. Content creator, client/approver, admin - ContentCal's functionality here allowed the creation of workflows and allowed it to function as a tool for managing client accounts. Being able to have multiple calendars/brands would be great for freelancers/agencies etc to manage client socials in one place.

Not as important but the Instagram grid view was handy for content planning too.