2008 and 2009 established the Cadillac CTS Sedan V6 and V-Sedan on the new, 2nd Generation platform.  Let’s look at the 2010 and 2011 changes for the CTS V6 Sedan and CTS-V Sedan:

In 2010, the big news was the arrival of the CTS Sport Wagon.  For the CTS Sedan changes (V and V6) included the 3L LF1 V6 replacing the 3.6L non-DI LY7 V6 as the base engine, and a new CTS Appearance Package for the V6s:

Deletions
	Exterior color (51U) Gold Mist
	Exterior color (58U) Black Ice
	(QUR) P235/50ZR18 Y-rated summer only blackwall tires
	(P62) 17″ x 8″ machined aluminum wheels
	(KAE) Sueded shift knob (CTS-V)
	(N45) Sueded steering wheel rim (CTS-V)
	(B19) Wood Trim Package
	(B20) Wood Trim Package
	(PDP) CTS Luxury Collection RPO Code. Content now in 1SD PEG
	(PDR) CTS Performance Collection. Content now in 1SF PEG
	(PDQ) CTS Premium Collection. Content now in 1SH PEG
New Features
	(WBP) CTS Appearance Package. Available on Sedan 1SF PEGs only.
	(JF5) Metal accelerator and brake pedals. Included and only available in (WBP) CTS Appearance Package.
	(E20) Chrome door handles. Included and only available in (WBP) CTS Appearance Package.
	(TL1) Special color grille. Included and only available in (WBP) CTS Appearance Package.
	(C8T) Clear tail lamps. Included and only available in (WBP) CTS Appearance Package.
	(UHN) 18″ (45.7 cm) painted wheels. Included and only available in (WBP) CTS Appearance Package.
	(AFM) Ebony and (AFN) Light Titanium interiors. Included and only available with (WBP) CTS Appearance Package.
	(AAY) Light Titanium and (AFO) Ebony Recaro seat trims for model 6DG69, 1SF PEG only.
	(CBG) LPO, Underhood Appearance Package
	CTS Sport Wagon Model
	New exterior and interior color codes
	Exterior color (GGX) Tuscan Bronze ChromaFlair. Available at extra charge.
	Exterior color (GIM) Vanilla Latte
	(Q0M) P245/45ZR19 Y-rated summer performance blackwall tires
	(PJ2) 19″ x 8.5″ polished aluminum wheels
	(LF1) 3.0L V6 SIDI DOHC VVT Engine
	(K14) Air filtration system, automatic cabin odor filtration
	(53F) Sueded steering wheel rim and shift knob (CTS-V)
	(03F) Wood Trim Package
Changes
	(UJ6) Tire Pressure Monitor System RPO changes to (UJM)
	(T96) Fog lamps RPO change to (T3U)
	(TT6) Xenon HID headlamps RPO changes to (T4F)
	(B19) and (B20) Wood Trim Packages RPO Codes change to (03F) Wood Trim Package.

And in 2011 the overall changes for the CTS Sedan were few; a lot of the excitement is centered around the upcoming Coupe and V-Coupe:

Deletions
	Exterior color (GBO) Blue Diamond Tricoat
	Exterior color (GIP) Black Cherry
New Features
	Exterior color (GAR) Black Ice Metallic. Available at extra charge.
	Exterior color (GGU) Evolution Green Metallic. Available at extra charge.
	(UVC) Rearview camera now part of (Y40) Level One Luxury Package.

There are often small changes that are not mentioned.