Calor means heat. It is the first new song since Italia, and it is out on Friday 25 September.
If you pre-save it, it appears in your Spotify or Apple Music library the moment it goes live, without you having to remember anything. That is the whole point of the button.
There is no Calor tee yet. There will be. Sign up at the bottom of the page and you hear about it before anyone else does.
Until then: the Disco era is the closest thing to the feeling.