I can't believe you guys download the new firmware straight from the console. I'd never have the guts to do that even on PS3.
Always download the firmware first on your computer then use USB to upgrade the console.
Seems to be the safest bet. WiiU's were bricked as well. Mine was fine at the time. I don't have an internet connection anymore at my house, so I already have the update preloaded on a USB for the PS4.