The second trailer is even better than the first and is very reminiscent of the first movie, with McClane in the airport and on the plane at the start. And a great final exchange of dialogue between the McClanes (which I won't spoil for you, go and watch).
Also, while the new poster isn't particularly inspiring, the tagline is: Yippee Ki-Yay Mother Russia! Love it.
I'm now optimistic and am earnestly hoping that I will have to eat a plate of humble pie about my initial predictions for the movie.