The size and specs of this rocket system are just insane. 42 Raptor engines on the booster and 9 on the spacecraft.
What also excited me was that it is not just about Mars. It's not called the "Mars transport system", but the "Interplanetary transport system". Eventually it could be used to setup bases on Europa, Enceladus and Titan etc.
So according to the vague timeline we might see the first ITS (Interplanetary Transport System) ship tests in 2018 and booster tests in 2019 with orbital testing starting in 2020. This would lead to the first Mars flights using the ITS at the end of 2022. In the meantime there will still be the Red Dragon missions (using the Falcon Heavy rockets) sending stuff to mars every two years starting from 2018. This timeline is obviously likely to be very optimistic, but even so it is very exciting.