General Motors has revealed new details on its plans for the limousine variants of the 2013 Cadillac XTS, which made its world premiere at last year's Los Angeles Auto Show.

The XTS will replace the DTS sedan not only in the passenger car market but will also take its place in Cadillac's professional vehicle lineup.

At the upcoming 28th Annual International Limousine, Charter and Tour Show that takes place February 13-15 at the MGM Grand Hotel & Casino in Las Vegas, Cadillac will unveil the XTS "W20 Livery Sedan Package" for professional use, which from what we understand, will retain the regular XTS' wheelbase length.

However, GM said it is currently working on two more versions of the XTS, the extended sedan and limousine, which Cadillac Master Coachbuilder (CMC) licensed manufacturers can build for the chauffeured transportation market by the end of the year.

With more than a decade on its back, the current Chevrolet Impala is well overdue for a replacement. Introduced in 1999, the eighth generation of the Chevy's full-size sedan switched to a front-wheel drive layout with GM redesigning the large sedan in 2005.

According to the Automotive News Data Center, Chevy has sold more than 2.8 million units of current model since 1999, with 2007 proving to be the vehicle's best year with a little over 311,000 deliveries. This year, through the end of November, GM has sold close to 161,000 Impalas.

But as we said, it's time for the current Impala to give its place to a new model. Last week, GM confirmed plans for the development of the 10th generation Impala, which will be produced at both its Oshawa Assembly Plant in Canada and the Detroit-Hamtramck Assembly Plant.

The big news for Cadillac today was the presentation of the all-new XTS full-size luxury sedan, and we've got some fresh pictures as well as two new videos including one that shows the car on the road (admittedly, not in the best quality) to share with you.

There's been some confusion about which segment the XTS belongs to since it will replace two models in Cadillac's range, the rear-/all-wheel drive STS and the front-wheel drive only DTS.

While the new XTS is Cadillac's largest sedan and as such, should be the brand's flagship saloon model, it does not target the likes of the BMW 7 Series nor the Mercedes S-Class.

The newest addition to Cadillac's sedan lineup, the 2013 XTS was fully revealed on Wednesday in advance of its first public appearance at the Los Angeles Auto Show later in the day.

The XTS takes its place as Cadillac's largest model replacing both the DTS and the STS. And large it is at 202-in. (5,131mm) long, 72.9-in. (1,851mm) wide and 59.1-in. (1,501mm) tall.

The XTS rides on a hefty 111.7-in. (2,837mm) wheelbase with Cadillac laying claims to 40 inches (1,016 mm) of rear legroom, which is about four more inches than the BMW 5 Series and Mercedes-Benz E-Class and about two more inches than the Audi A6. It also gets a capacious boot with 18 cubic feet (509 liters) of space.

The new Cadillac's exterior styling is more adventurous than the DTS/STS models and almost identical to last year's XTS Platinum concept study.

On Wednesday, for a split second only, General Motors posted a photograph of the new 2013 Cadillac XTS on its U.S. website by mistake, but that was more than enough time for the picture to be shared all over the world.

Since there's no point in hiding anymore, GM today released a full-blown version of the same image in high-resolution providing us with a more detailed look at Cadillac's new flagship model that replaces both the DTS and the STS in the carmaker's lineup.

Previously, we had a chance to get a peek at the new XTS's interior with a cutout dashboard meant to show off the firm's new CUE (Cadillac User Experience) infotainment, navigation and communication system that will launch in 2012, not only in the full-size sedan, but also in the ATS compact saloon and SRX crossover.

An official photo that was published allegedly by mistake on Cadillac's public site earlier today, gives us our first glimpse at the production 2013 XTS luxury sedan, one week ahead of its world premiere at the Los Angeles Auto Show.

The picture was captured before it was removed from the website by a reader of Jalopnik, which then confirmed its authenticity with Cadillac.

The production model is almost identical to last year's XTS Platinum concept study that was displayed at the 2010 Detroit motor show. In fact, from this angle, the only noteworthy styling changes appear to be limited to the headlamp and fog lamp assemblies and the larger and more practical mirror housings.

It looks like the all-new Cadillac XTS that will replace both the DTS and STS sedans will make its world premiere at next month's Los Angeles International Auto Show, or at least that's what is being reported by InsideLine.

It was anticipated that the XTS would debut either in LA in November or at the Detroit Show in January as General Motors has already revealed that sales will begin in the spring of next year.

There was a time when premium car buyers were content with full leather upholstery, plenty of wood trim, plush carpets and a great sound system. That time is long gone. Nowadays the latest fad is infotainment systems.

Cadillac may have lagged in this department, especially when compared to its top rivals, but from next year, the Detroit company plans to more than make up for it.

Today, Cadillac unveiled the first interior shots of its DTS- and STS-replacing saloon, the upcoming XTS. However, contrary to standard practice, it didn't focus on the quality or the abundance of space. Instead, it revealed its new CUE (Cadillac User Experience) infotainment, navigation and communication system that will launch in 2012 in the XTS, the ATS and the SRX crossover.