Our teardown iMac Pro sports these "entry-level" specs:

8-core, 3.2 GHz Intel Xeon W processor with Turbo Boost up to 4.2 GHz

32 GB (4 × 8 GB) of 2,666 MHz DDR4 ECC

AMD Radeon Pro Vega 56 GPU with 8 GB of HBM2 memory

27" display with 5120 × 2880 resolution and support for one billion colors (P3 color gamut)

1 TB SSD

Higher-end configurations with up to 18 processor cores will be available in a few weeks' time—if you're looking to spend $13,000 USD or more, that is.