Yes, this is actually true. Microsoft will give you $100 off an Xbox One if you trade-in your PS3.
Microsoft has been sending an ad via email where it states that you can “ditch” your PS3 for $100 store credit towards an Xbox One. This ad, however, never mentions the other system that’s part of this deal, the Xbox 360.
If you would like to trade-in your PS3 or Xbox 360 to get $100 off an Xbox One make sure to click here for information. This offer ends on March 2nd.