We just added support for Adobe Web fonts as well, which added 50 fonts to the drop down selection.Paul Arterburn commented
We did just add support for Adobe Edge Web Fonts. Unfortunately there is a high overlap with Google's offering so it only added around 40 additional fonts. The Adobe Edge Web Fonts list can be found at https://edgewebfonts.adobe.com.
We're continuing to explore how we can add additional support for customers to upload their own font files and display them.