It looks like the BlackBerry Z30 will be the first BlackBerry 10 device with USB host support. Current BlackBerry models can still connect to peripherals over USB but on the PlayBook and Z30 were given the correct hardware to allow you to plug USB drives like flash drives into the phone and view the files. This is a great way to add storage to a device but its a real shame that its not available on older devices due to them not having the right hardware.
What do you think about USB Host? Is it a critical feature?