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Surface book will have 18W Gpu

Well whatever the DGPU is it better perform significantly better than the Iris 540 or I'm looking at SP4 instead.
It's going to be interesting to see the results in a couple weeks.
There's some preliminary benchmarks of the Surface Book on reddit (using Unity's webgl benchmark):

My MS store has a DGPU surface book. What tests can I run? • /r/Surface

Keep in mind it's not clear the tests are using the dedicated video vs the integrated. I highly recommend if the power of the dGPU being a make or break factor (I actually suspect for most it won't be) that they simply just wait until legitimate benchmarking can be done in a fully released unit.