Voting starts in March for the Drupal Association Board election.
I have a repository for this new library set up at https://github.com/cweagans/phonenumber-php
This library needs to be completely standalone. We'll eventually submit it to Packagist, and if this happens soon, we'll try to move some of the validation, storage, and parsing logic into core. We also need to set up that library with some tests and have it run through Travis.