Wi-Fi is handled by a MediaTek MT7612UN (Likely a variation of MT7612U 2x2 802.11ac Wi-Fi Module)
We find a Samsung Seagate Spinpoint M9T ST2000LM003 2 TB 5400 RPM with 32 MB Cache SATA III 6.0 Gb/s hard drive. Try saying that ten times fast.
Luckily, the One S packs a sweet SATA III drive, an upgrade from the original's SATA II. Plus, you can always add an external hard drive, thanks Microsoft!
Thanks to:
https://www.ifixit.com/Teardown/Xbox%20One%20S%20Teardown/65572
Not sure if known but the S uses SATA III and 802.11ac
Not sure why this isn't advertised.