No Car Packs to download, no '15 Mustang on 360?

I was just curious is there any content to download that i am not seeing? i have it for 360 and i don’t see any car packs to download and i can’t find the '15 mustang. is that only for xbox one?

Unfortunately the 360 version has no dlc at this point and there hasn’t been any details given about anything in the works.