We don't have plans for a higher-powered spindle at this time. We believe that the 720W motor is the perfect balance of weight, precision, and power for Origin.
If you are working on a project that requires lots of horsepower, we recommend doing one or two passes with Origin, then using a following bit with a larger motor to cut through lots of tough material at once. Here's an example video demonstrating this technique on a thick slab table.