That's the Estimated Earnings, explained in the text as an estimate of the distro plus the votes. Have to make some assumptions there as depends on member behaviour. Maybe in the future can split that number into its two components for extra clarity. But even then, the numbers won't "add up" globally as, for example, a 5000 MPATH account will be getting more rewards but votes are capped at 100%. So is really a way to have one parameter to measure progress week on week.
:-)