Go here for the Aerospace Corporation’s presentation given to the Norm Augustine led review of US human spaceflight plans committee 17 June meeting. Because of the complexity of the subject matter the slides content’s meaning is not always clear but what can be gleaned is that
- Delta IV launcher could be ready in 5.5 years
- development period includes upper stage re-competition
- new upper stage with J-2X could deliver better performance than Ares I