I will make 4 predictions:
1) This is going to be bad for the industry.
2) If Evolv wins, Yihi is next, followed by everybody else.
3) Unless the board itself is ruled to be a too-close copy, that is if Evolv prevails under the theory they own the idea of "wattage control," Joye can probably continue selling the same board with a firmware upgrade requiring the user to set power in volts rather than watts, and just have the board calculate and display the applied watts as measured against the coil resistance as a derivation of Ohm's Law, which can't be patented. Indeed, they might even moot the suit like that. And so long as they sold it in voltage mode, they might even get away with a free-download firmware upgrade that changed it back to watts control.
4) When word of this gets out, because of 1) above, methinks Evolv will see less interest in their boards.