Here’s an article I wrote for CSS-Tricks where I discuss all the benefits and troublesome problems of the new font format that Nick Sherman mentioned at Ampersand:
I think there’s huge potential for a new variable font format to become a key part of the designer’s tool belt. It would greatly improve the reading experience of general users of the web, too. But that doesn’t mean we can ignore the many problems and hurdles that we have to overcome to get a draft spec agreed upon.
Make sure to check this thread on Typedrawers about the current work being done to implement a working solution.