This is the new Mercedes SL, details of which have been leaked onto the internet ahead of the official launch date later this month.It may look like an entirely new model, but in reality this is a facelifted version of the current SL with updated steering and new engine range.The most significant addition is the SL280; a new 228bhp, V6 model that will become the entry-level option. Claimed figures have the SL280 returning as much as 30mpg, whilst the 0-60mph run is done in 7.8sec. A new variable ratio, speed sensitive steering system has also been added to enhance the SL's 'sporty driving pleasure' by making it more responsive. The same system has been fitted to the new SLK, which was revealed last year.The V6 unit in the SL350 has received a significant upgrade, with power increased to 311bhp on the current car's 268bhp. Otherwise, upgrades are restricted to the optional 'Intelligent Light System', facelifted interior and new infotainment system. The biggest change is cleary the front end, which reflects the latest Mercedes design cues and is also intended to link to the historic SL Roadster models; the powerdomes on the bonnet and air outlets in the front wings take inspiration from the iconic 1954 300 SL.The new Mercedes SL will be unveiled officially unveiled at the Geneva motor show in March, before going on sale in April.