The Aventador is likely to get a similar type of open-air treatment as the Murciélago did before it. And rumor has it that the Gallardo will spawn a convertible version of the purist's choice LP550-2 before the entire line is eventually replaced by the rumored Cabrera, which will almost certainly get a roadster version as well.
But beyond the existing core range, Top Speed suggests that there are a couple more open-air Lambos in the mix. For one, if and when the Sesto Elemento reaches limited production for public consumption, it could lead to a droptop version as well. After all, Lambo could hardly resist the prospect with the Sesto's spiritual predecessor, the Reventón, which lead to a limited run of 15 roadsters.
Finally rumors are circulating that, if Sant'Agata opts to build the Estoque sedan over the prospect of a crossover, this could lead to a convertible version as well. Of course, that's skipping the front-engine coupe that would likely bridge the gap, taking a similar path to the Panamera from sister-company Porsche.
Between the Aventador, Gallardo LP550-2, Cabrera, Sesto Elemento and Estoque, Lamborghini certainly appears to have a lot of prospects up in the air. We'll just have to see which ones open up.