2013 Cadillac ATS 3.6 AWD
Engine:3.6L V6 Power:321 HP / 275 LB-FT Transmission:6-Speed Auto Drivetrain:All-Wheel Drive Curb Weight:3,629 LBS
2013 Cadillac ATS 3.6 AWD Review - Autoblog
2013 Cadillac ATS4 3.6 Premium First Test - Motor Trend
Motortrend has the 3.6 AWD ATS coming in at 3682. The current LFX comes in at around 320-330 lbs right? The new LT1 comes in at around 465 lbs. So just with the difference in the engine weight you're looking at 3800ish lbs. I think the Camaro might come in at around 3700+ lbs by switching to the Alpha platform.
Who knows though...