They are not bricked, the update is just buggy. They will release a fix and you will have to put it on a USB and upgrade from that. Bricked means it is completely unusable. It is a sensationalized title.
From wikipedia: "In one common sense of the term, "bricking" suggests that the damage, often a misconfiguration of essential on-board software, is so serious as to have rendered the device _permanently_ unusable."
What? Your CPU burnt during the last upgrade? Not bricked! You just need to go through the simple procedure of soldering a new CPU!