It's no joke. Turn off your sound and go to
dtv.gov. (The site looks like it was done by a 13-year-old; your federal gummit at work.)
Obsolete is a little strong of a word... you will be able to buy converters to get the signal and watch it with an old TV.
Also if you are on cable or satellite these things do not matter to you, it's only over-the-air broadcast that will change.