There's been no detailed presentation of the whole Mars architecture; Musk has promised to present at least an overview this September at the International Astronautical Conference.
In the meantime, it's known that there's a high-performance methane-fueled engine in development as part of the project ("Raptor"), with some component tests already underway at test facilities, and several dropped hints about components (including rockets substantially more powerful than the Saturn V used for Apollo lunar missions), but not enough publicly released to determine much about how operations would work.
In the meantime, it's known that there's a high-performance methane-fueled engine in development as part of the project ("Raptor"), with some component tests already underway at test facilities, and several dropped hints about components (including rockets substantially more powerful than the Saturn V used for Apollo lunar missions), but not enough publicly released to determine much about how operations would work.