One of the Easter eggs Apple hid inside the watchOS 4 update got debuted to users around the world as the clock struck 12 to welcome the New Year. If you own an Apple Watch, you might have seen (or you will be seeing) fireworks light up your watch’s face. The Apple Watch does the same for birthdays, too. So, if it isn’t midnight yet where you are, you can keep your eye out for this.
Source: 9to5Mac