A proper Cadillac that GM let rot on the vine way too long. At least they could have updated the transaxle to the 6 speed currently found in the W-body Impala. You know the very same trans axle that everybody insisted wouldn't fit in the old W and G body based cars. That at least would have increased MPG a little and given the Northstar a little more flexibility. They also could have used the VVT 320 HP version of the Northstar for more power and plenty of torque unlike the weaker 3.6 LFX in the current and not as cool XTS.