Huawei doesn't not mention it, but perhaps it should. The OEM is quietly slipping the faster 25 W version of the GeForce MX150 into its upcoming mid-tier Ultrabook whereas most competitors are using the much slower 10 W version. Even the pricier MateBook X Pro uses the the slower 10 W GeForce MX150.
https://www.notebookcheck.net/To-our-surprise-the-Huawei-MateBook-13-uses-the-faster-25-W-1D10-GeForce-MX150-GPU.394761.0.html
In fact, Huawei mentioned it when Matebook 13 launched in China :)
Funny I just noticed that my notebook, asus 430UX with i7 8550U and MX150 has the 25W version. I did not know.
Zenbook UX430UN is a good example of a 25W MX150 that throttles significantly and actually performs like the 10W Max-Q version.
Matebook 13 will be likewise.