[Jared Russell]

In the various pics of the boiler that are floating around from kickoff, you can see that the impeller holds 14 balls around its circumference. From other pics on the official FRC Facebook page, you can see that the impeller is driven by what appears to be a miniCIM with a 2-stage VersaPlanetary gearbox. I don't see an encoder anywhere (though there could be one somewhere that's not pictured), so you can probably assume that these things are controlled only by a constant voltage DC source.

A miniCIM has a free speed of 5840 rpm at 12V. We don't know what reduction is being used, but the largest single stage that Vex sells is 10:1, so the gearbox is 100:1 or less. Obviously it could be a different reduction, the motor could be run at less than its free speed, and the impeller won't be packed fully during each revolution (and FIRST could still be iterating on the details), so YMMV, but if you assume 12V and 100:1 you get a theoretical max of about 13bps. This is just a piece of trivia at this point though given all the unknowns.