I've been following it since even before that point when it was still called the "MCT", but without any explanation of what the acronym meant. A long time coming. This is the beginning of a new era in space exploration.
I believe there was a BFR originally [1], and it just returned later. But the real old one was the Falcon X and Falcon XX [2], which were to use the "Merlin 2" engine (giant RP/LOX engine a la the saturn V).
[1] https://en.wikipedia.org/wiki/SpaceX_Mars_program#Early_heav...
[2] https://en.wikipedia.org/w/index.php?title=Falcon_X&oldid=38...