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13" rMBP:
All 13" models have 4th generation dual-core Intel i5/i7, integrated GPU (Intel Iris 5100), PCIe flash and 802.11ac.
CPU (GHz)/RAM (GB)/Flash (GB)
2.4 i5-4258U/4/128
2.4 i5-4258U/8/256
2.4 i5-4258U/8/512
2.8 i7-4558U/8/512
2.8 i7-4558U/16/1TB (BTO)
15" rMBP:
All 15" models have 4th generation quad-core Intel i7, PCIe flash and 802.11ac.
CPU (GHz)/RAM (GB)/Flash (GB)/Graphics
2.0 i7-4750HQ/8/256/Iris Pro 5200 --(i7 4750HQ confirmed in 2nd source)
2.3 i7-4850HQ/16/512/Iris Pro 5200 + Nvidia GT750M with 2GB vRAM
2.6 i7-4960HQ/16/1TB/Iris Pro 5200 + Nvidia GT750M with 2GB vRAM (BTO)
The low-end rMBP 15" with iGPU is intended to replace the current non-retina MBP 15".