You Can Now Pre-Order Surface Book 2

Grab your credit cards and kiss caution to the wind, folks: You can now pre-order some Surface Book 2 models in both 13.5- and 15-inch versions.
Looking over the Microsoft Store website, it appears that the following models are available for preorder:
13.5-inch, Intel Core i5, 256 GB. $1499
13.5-inch, Intel Core i7, dGPU, 256 GB. $1999
13.5-inch, Intel Core i7, dGPU, 512 GB. $2499
13.5-inch, Intel Core i7, dGPU, 1 TB. $2999
15-inch, Intel Core i7, dGPU, 256 GB. $2499
A couple of notes here.
Inexplicably, Microsoft doesn’t (clearly, at least) specify the amount of RAM you get with each model. But the available amounts are 8 GB and 16 GB.
I don’t see any customization options. For example, you can’t order the base model, which probably comes with 8 GB of RAM, and upgrade it to 16 GB.
We know that the dGPU in the 13.5-inch versions is an NVIDIA 1050 NVIDIA GeForce with 2 GB of RAM, but the 15-inch version(s; there’s only one right now) includes 1060 NVIDIA GeForce GTX graphics with 6 GB of RAM.
The release date for each model is listed as November 16, which is next Thursday.
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