Pretty sure the Breath uses an internal / semi-integrated / Zerostack headset (all the same thing). Cups still push into the frame, but the frame is over sized to allow it to sit within the headtube.
Bearings then drop into that cup
http://huckit.net/pub/headsets.jpg
The Sky frames use a wired mix of fully integrated & semi integrated headset. The top bearing drops straight into the frame to sit against a machined race (integrated), while the bottom bearing fits into a semi-integrated cup