Forecast report allows you to get a quick glance of allocations for chosen projects / groups of people.

Select report type allows you to see the values in:
Revenue
Cost
Hours

Revenue = Hours allocated for a person for Invoicable project * Hourly rate
Cost = Hours allocated for a person * Person's Cost Price
Hours = Hours allocated for a person

Forecast report's numbers are based on allocated hours.

Exclamation mark (!) next to the employee's row indicates that there is a note written regarding that project role. By hovering over it you can see what the note says.