Details available already on their online store, though it's unresponsive at the moment as everyone is trying to check it at once.

They already did. On the UK store:

14"

1.8-Core CPU, 14-Core GPU, 16GB Unified Memory, 512GB SSD Storage - £1,899.00

2. 10-Core CPU, 16-Core GPU, 16GB Unified Memory, 1TB SSD Storage - £2,399.00