I believe they have or are discontinuing the XLR and XLR-V due to very bad sales. It was pitched as a cheaper alternative to the Merc SL, but it couldn't outgun it in the HP dept.
XLR was a disaster sales wise. It also was more of a looker than a true performer. If I recall it had a price tag that wasn't far off from a Mercedes SL either which simply doomed it to fail. The Mercedes SL is the benchmark for the 2-door hardtop luxury convertible....the XLR didn't stand a chance.
First gen CTS-V had a ton of HP with it's Z06 sourced V8 but abrupt power delivery and wheel hop that was unacceptable in a luxury-performance sedan. The new gen CTS-V supposedly has all of the wrinkles of the first gen ironed out. I would love to test drive one but one it comes down to it I think that resale for an American luxury car does not hold up to foreign competition.
With that said Cadillac has come a LONG way from the disasterpiece POS lineup of the not-so-distant past. Lincoln on the other hand........still an old-man's blue haired embarassment of badge-engineered garbage.