It bumps the speed and officially supports Displayport and PCIe protocols being tunneled through.
Also, as a tiny nit for seemingly no other reason than to piss us all off, they have decided the “correct” way to write it is “USB4” (no space). This is in contrast to every previous version of USB such as “USB 3” (space).
Briefs. Actual support. The singular function underwear has.
Boxers are just commando with extra steps. Utterly pointless.
I consider all enlightened boxer brief centrists to be strictly in the briefs camp as boxer briefs are just briefs with leg extensions.