AutoBlog reports that Mercedes-AMG is developing a successor to the SLS AMG. This vehicle will use a 12-cylinder engine that is mated to an electric motor and battery pack. This vehicle will aim to deliver peak performance and decent fuel economy.
We don't have a timeline for the release of this new halo car, but we can assume that it is several years away still.
And BMW is working with Lexus on the next LFA. So it seems like everyone is working on their thing at the same time. we will have to see what ends up happening with them all. I think that though these are obviously very low volume cars, the prestige that the brand gets from theirs beating the others is quite valuable.