I would love to know if there are some resources for typography on mobile (iOS). At WWDC 2013, it became very clear that iOS 7 will make a huge push in the use

I would love to know if there are some resources for typography on mobile (iOS). At WWDC 2013, it became very clear that iOS 7 will make a huge push in the use of typography as one of the main ways to give an app more personality. In the past the emphasis was put on world-like textures, graphics, etc. Any advice on this matter?