More aliases, better aliases, fine-tuned FontConfig settings. Also, Emoji support (optimized for Firefox, where Emojis are colorful). More well hinted fonts are included, some of which are now grouped in a new lowdpi-extra package.
The common-aliases and lowdpi-aliases font packages are required for supporting the web-safe aliases.
The common-extra package adds support for Emoji, symbols, hieroglyphs.
The lowdpi-extra package adds more Unicode coverage, extra monospaced fonts, and several well-hinted fonts sponsored by Google back in 2010-2013.
Installation instructions in README.rst.