an optical phenomenon, especially in the desert or at sea, by which the image of some object appears displaced above, below, or to one side of its true position as a result of spatial variations of the index of refraction of air.
something illusory, without substance or reality. Synonyms: fancy, phantom, illusion
Mirage, Military. any of a series of supersonic, delta-wing, multirole French fighter-bombers.
"something on the horizon takes shape on Feb 19" ?
Based on the evidence I am going to say that Rivian plans to send us all some shrooms that will cause us to see things that don't actually exist...
Only one of the four images posted on the @Rivianofficial Instagram site actually shows a vehicle EXTERIOR and it is noticeably a black and white photo. I'm guessing that "Mirage" is the name of a new exterior color that Rivian will be offering for the R1T and R1S. Given that the rest of the Rivian pallet tends to have a fair amount of colder, gray undertones (Other than the bright blue and compass yellow), I'd expect more of a light stone/sand shade vs. an orangey Coyote tan or a Toyota (peanut butter) sand.