The Australian website GoAuto figured that if Bob Lutz wouldn't give up the name of the proposed small Cadillac, it would coin it. So the new Caddy could be known as the "ATS." It's certainly anonymous, but not any more contrived than the rest of the alphabet soup that makes up Cadillac's naming structure.
Regardless, Lutz told the Aussie web-pub that the ATS, "... is, or would be, about the size of a BMW 1-series – maybe a tiny bit bigger to enable larger wheels." Sounds good to us, but the on-again, off-again proposal of rear-wheel drive cars coming out of the General causes us to remain skeptical. If it does come to fruition, it will be built atop the Alpha platform with the help of Holden.
[Source: GoAuto via Motor Authority]