[josho]

I wonder if Apple's ios7/Yosemite icon designs are a shift in this direction to vectors. E.g. the icons look like they are authored as a vector. But, I wonder if the platform APIs are not yet ready to handle vectors everywhere and seamlessly between pixel/vector formats.

[seanmcdirmid]

Almost all of these are done as vectors in Illustrator and pre rasterized into pixels (with touch ups in PS if necessary).

[bennyg]

Absolutely. No designer worth their salt is starting with PS for these app icons.