Welcome to the future, Julius.
Nearly all TV production is now done in 16:9 widescreen. In the early years of 16:9 production, when most viewers were still seeing the shows downconverted to SD on 4:3 screens, it was considered important to produce 16:9 shows in what was called "4:3 safe," with no important visual content outside the center portion of the screen. That's a pain to do, because every shot and every graphic have to be carefully composed to look good on both 16:9 and 4:3 screens, and it means a lot of creative compromises along the way.
Now that the majority of US TV households have at least one 16:9 screen (65% according to one 2010 estimate), producers have decided it's more important to give them a truly fullscreen experience than to continue to cater to a rapidly dwindling number of viewers still watching on older 4:3 screens.
What Fox is doing now, CBS and NBC and ABC will be doing in a year or two as well. Get used to it. It's not going away.