Well it's done, colouring effects were tricky to do (and I say that as an understatement) but it's done, please note this isn't a spoiler its just fan speculation, we still nothing of vahlen's fate, also at this point am staying off any spoilers so please don't post any! (except shen's fate I know about that one)



As for the story of the pic the answer lies in the title, this is in fact a showtrial where a captured vahlen (after numerous mind control by the sectoid hybrid) is on trial to be accountable for her part of Xcom's 'horrific war crimes' but the sentence was already set before the trial started. With no defence to challenge the claims of genocide and abductions along with inhumane experiments on the 'peaceful' aliens, the crowd who are wayed by the one sided evidence order her execution.



The spokesman in responce finds himself 'reluctant' but nonetheless is prepared to abide by the wishes of the people, however a young girl accompanied by her grandfather points out to the crowd that killing is not what Advent wants, nor should they make Advent killers, even on those that may deserve it arguing that humanity have become so much more because of Advent.



The spokesman overhears this and is 'swayed' by the gesture putting a halt to the execution and the crowd in turn are moved by this.



The thing is though, the girl and the 'grandfather' are actors doing their part in mainpulating the crowd to not only believe the crimes of Xcom and the old goverments but that Advent is morally superior.



The trial comes to a close and vahlen is taken to her cell till another showtrial occurs that is.



And there you have it.