The most interesting thing in the #raspi4 news is USB 3—*not* because it's USB3 per se, but because it's a change from the #raspi3: of all the #raspi HW bugs, one of the biggest thru 3b+ has been "supports only 7(!) USB bulk endpoints".
See pg. 201: https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2835/BCM2835-ARM-Peripherals.pdf