Re: What's with all the Union Jacks in the trailer?
I see no reason why the Union Jack can't fly next to the Flag of the United Federation of Planets. I'm sure the United Kingdom still exists as a polity within the United Earth polity, which itself still exists within the Federation.
Though I, too, would have preferred to see the Flag of United Earth fly alongside the Union Jack and Federation Flag.
Also, I'm more bothered by the fact that the Union Jack seems to be upside down.
"Every line of serious work that I have written since 1936 has been written, directly or indirectly, against totalitarianism and for democratic Socialism, as I understand it." - George Orwell, 1946