USB is suffering a clusterf*ck of names. Last week 3.2 was finalized, and today the media is talking about USB4. This one will bring Thunderbolt 3 speeds.
You probably won’t see USB4 hardware in the near future, however. The USB 3.2 specification was published in 2017 and is due to show up in products this year. USB4 is just a specification at the moment, and it hasn’t even been published. The publication date is scheduled for sometime in mid-2019, which means we won’t likely see USB4 hardware until 2020 or beyond.