Skipping ahead to the good stuff, we get a quick look at the biggest improvement in the iPad 4—the A6X and its supporting hardware:

Apple A6X Processor

SK Hynix H2JTDG8UD2MBR 16 GB NAND Flash

Apple 338S1116 Cirrus Logic Audio Codec

343S0622-A1 Dialog Semi PMIC

Apple 338S1077 Cirrus Logic Class D Audio Amplifier

QVP TI 261 A9P2 Boost Converter (likely)