"The third component, the "Applications processor" is the A4/A5 chip. Apple designed this under license from ARM and so Apple owns the IP. Samsung simply operates as a foundry."
No, Samsung actually designed and manufactured pretty much the entire A4.
"The Cortex-A8 core used in the A4 is thought to use performance enhancements developed by chip designer Intrinsity (which was subsequently acquired by Apple) in collaboration with Samsung."
Sorry, what you are saying makes no sense. They designed the chip alongside of Intrinsity.
Samsung provides the same chip as a different part number:
"The resulting core, dubbed "Hummingbird", is able to run at far higher clock rates than other implementations while remaining fully compatible with the Cortex-A8 design provided by ARM. Other performance improvements include additional L2 cache. The same Cortex-A8 CPU core used in the A4 is also used in Samsung's S5PC110A01 SoC."
No, Samsung actually designed and manufactured pretty much the entire A4.
http://en.wikipedia.org/wiki/Apple_A4#Design
The story seems to be different with the A5.