We're still tuned into the SEMA Show, but the news from the fast approaching Los Angeles Auto Show keep dropping in. Now we've learned that General Motors will stage the global reveal of a never-seen-before Cadillac concept study. not surprisingly, details remain slim. It could be a concept for Cadillac's recently confirmed small sedan (often called ATS), which will go up against the BMW 3-Series and Audi A4, or something different altogether. We just don't know. But feel free to speculate in the comments section below.