OK, many on the internet are saying that the Cybbertruck did not have windshield wipers nor rear mirrors because that was an oversight since it was a prototype made in a hurry. However, the Model 3 had windshield wipers at its reveal. The Model Y had windshield wipers at its reveal, too. In an interview with Marques Brownlee (a YouTuber), Elon Musk said, "“Manufacturers are required to have side mirrors [on their cars], but I believe that the owner is not.” Elon is suggesting that the Cybertrucks and Roadsters are going to be sold with owner removable side rear view mirrors. A panoramic rear view will be available via the rear view LCD screen replacement for middle rear view mirror. This will replace the function of the side rear view and central rear view mirrors.
Also, the Cybertruck will feature lasers to zap water off the windshield instead of windshield wipers. That's why it did not have one at the reveal. At high speed, a hydrophobic coating on the glass will wick water away from the glass just like on airplanes. At low speed, a laser will be firing from INSIDE the glass kinda like how a laser fires from inside a fiber optic cable. This will prevent the laser from firing outside in the environment, blinding people. As long as you do not touch the glass while the vehicle is moving, you will not get your hands burned. Also, ALON (the material that the glass is made of, ALON, or aluminum oxy nitride) has a low specific heat, meaning that if you heat it up, the temperature drops quickly after you turn off the heat source, like a heat sink that's on the motherboard of your computer. So, if you stop the car, the laser turns off. If you immediately touch it, it is not hot to the touch and therefore safe to touch.
Here is a video with more details;
P.S. BTW, the video asks you to donate to my best friend who has cancer. Ignore that request. She passed away last night. I don't think I will be making any more YouTube videos after this.... If you accidentally donated after she passed away, funds will go towards funeral expenses, i guess. Or it can be refunded, whatever.....