At the heart of Android 4.0 is the Roboto font. More important than even hardware -- which as we all know too well iterates every few months or so -- this is the building block for Ice Cream Sandwich. And whether you're a flourishing font nerd or just have a casual interest in what goes into the best mobile operating system in the world, it'd behoove you to give Matias Duarte's excellent explanation of why Android moved from the Droid font, how they designed it, and how it's going to impact you on a daily basis. It's a fascinating look into the design evolution of Android.
Read: Hello Roboto on Google+