This is huge for iOS users. You can now install Hoefler & Co. fonts directly for use on your iOS device. It’s as easy as tapping a link on their website, which installs a profile in settings and viola your fonts are there. I just added a few and it works smoothly and Pages/Numbers/etc recognize the change immediately.
I say this is huge not because iOS fonts are shitty, but because I use Ideal Sans for all my documents and now I can finally edit them on my iPad without having to substitute the font — that’s what is huge.