The next 24 months will be a busy time for Cadillac in terms of new products as the Detroit automaker has plenty on its plate including the presentation of a flagship limousine loosely based on the well-received Ciel convertible sedan concept.

A report from Automotive News (sub. required) citing sources from within General Motors outlines Cadillac’s plans for the 2013-15 model years.

According to the insiders, GM has given the green light for the development of a full size, rear-wheel drive luxury sedan that will sit atop of the range rivaling the Audi A8, BMW 7-Series, Jaguar XJ and Mercedes-Benz S-Class.

This model will be built on a new platform codenamed Omega and is expected to be offered with a choice of V6 and V8 engines, possibly in supercharged form, an eight-speed automatic transmission and the option of all-wheel drive. The styling will draw heavily from last year’s Ciel study. The as-of-yet unnamed flagship is said to arrive sometime in 2015.

Putting aside the new 2013 XTS front- and all-wheel drive sedan that is currently Cadillac’s largest saloon model and which went on sale in June, the wreath and crest brand will launch the updated SRX crossover this fall and the BMW 3-Series-rivaling ATS sedan in August.

The Alpha rear-wheel drive platform-based ATS will likely spawn a V-Series Performance model and a coupe within the next two years, while Autonews reports that plans for a convertible variant have been put on hold for the time being. Cadillac will not be making a sport wagon variant.

Next up for Cadillac will be a replacement for the all-important CTS that is due to arrive in sedan guise in the second half of 2013 as a 2014MY. It will grow in size to better compete with the BMW 5-Series and Mercedes-Benz E-Class.

The CTS Coupe and V-Series performance variant will follow by 2015, while sources state that there won’t be a station wagon model.

Other models planned by Cadillac are said to include an all-new SRX crossover in late 2014 or early 2015, a larger crossover based on the Lamda platform that underpins the Buick Enclave, Chevrolet Traverse and GMC Acadia, a replacement for the Escalade SUV built on the next Chevy Tahoe / Suburban and GMC Yukon platform, and the ELR Coupe equipped with a similar electric propulsion system to the Chevy Volt in late 2013.

2011 CADILLAC CIEL CONCEPT 1957-1958 CADILLAC ELDORADO BROUGHAM