The official word coming down from the team is that Hayward will in fact require surgery on the ankle, which suffered both a dislocation and broken tibia, but no timetable for his return has been offered.
Given the risk of rushing back too soon from such a serious injury, this is probably the wisest path. And it's also worth noting Brad Stevens says he's expecting a full recovery. We aren't hearing anything about ligament damage (yet), or his return this season being ruled out, either. So, take that with a grain of salt - as bad as this has been, it most certainly could be worse.
The #Celtics have not yet declared Gordon Hayward out for the season, despite his need for surgery. Good news - for now.