The emoji craze has had the nice side-effect of forcing a lot of projects to make sure their stuff supports Unicode properly, because now it's something that even English-speaking software users can appreciate. It's a good thing.
Sort of. The announcement is obviously silly, and April-Fools-y, but the changes in nginx aren't--what it's really about is Unicode in general, not emojis specifically.
More and more programs supports unicode now. Why stop at Emoji? APL is going to take back the world finally. Anybody still writing a multi-letter identifier in your code? So 80's...