After installing Windows 10 Pro on the i7 Book I noticed the tablet comes with a firmware Intel TPM 2.0 module (seems like all the Skylake chips may come with one?) which lets you enable Bitlocker on the internal SSD. The m3 does have AES acceleration so it seems to have no significant impact on performance. I didn’t see this mentioned anywhere in the specs or reviews.
The i7 Book comes with Windows 10 Home which doesn’t have this feature enabled.