General Motors has reportedly given the go-ahead for a large flagship Cadillac sedan as it continues to prepare its luxury brand for an all-out attack on every possible segment its main rivals compete in. This is according to Automotive News, which projects the flagship sedan will be built on a new RWD platform dubbed Omega and launch sometime in 2015 to challenge the likes of the BMW 7 Series, Mercedes-Benz S-Class and Lexus LS in the full-size luxury sedan segment.

Styling cues are likely to come from the open-top Ciel sedan concept Cadillac (pictured) unveiled at Pebble Beach last August, with potential powerplants to include a 3.6-liter V6 and optional V8. An eight-speed transmission and AWD option are also expected. With the ATS compact sedan arriving to take on the BMW 3 Series, Mercedes-Benz C-Class and Lexus IS, and a new CTS to arrive next year in the same class as the 5 Series, E Class and GS, the flagship sedan continues Cadillac's offensive and is essential for the marque not only to make headway in car-hungry China but also to boost the brand's image in established markets.

Other models in the pipeline include ATS coupe and convertible variants in 2014, a large crossover using an upgraded version of the Lambda platform in 2015, a new Escalade SUV in the latter half of 2013, and an ELR coupe powered by the Volt's plug-in hybrid technology in early 2014.