Nothing kills the excitement of a new gadget faster than it randomly restarting on your wrist, so go update your Watch tonight and save yourself the headache. Not too much more to say on this new item. I check for updates on all of my devices multiple times a day, but I’m a bit obsessive.
New devices and software often get updates right after a launch or major update. As a rule of thumb, update regularly. The main exception is major software updates (you can’t control hardware). I do often recommend holding off on major software updates until the next minor version update related to the major update.