Doctor Who: Let's Kill Hitler Preview

It's time- it's back! Three months back, we witnessed the death of the Doctor, the emergence and supposed defeat of the Silence, and the discovery that River Song is Amy and Rory's daughter Melody Pond. But what does all this mean for the story at large? Here's just about everything to watch out for this Saturday in Let's Kill Hitler...
LET'S KILL HITLER- I thought it was best to deal with the rather controversial title first. Through a series of unlikely events involving time-travel, crop circles and offices, the Doctor and the Ponds find themselves reunited in 1930s Berlin, and hence find the leader of the Third Reich. What all the killing in the name is about I don't know, but we're going to meet mysterious robots which fix parts of time which are going wrong, so perhaps a new assassination attempt is coming for Hitler? Don't worry, though- there's no positivity with regards to the character, Steven Moffat says, he'll instead be portrayed comically and taken the mick out of. Oh yes, and apparently Rory gets to punch him!
RIVER SONG/MELODY POND- This episode is going to be heavy on new information based aroudn River: Matt Smith has said Alex Kingston gives her best performance yet as River, and rumour has it the new girl depicted as flying on the TARDIS in Ep 8 is in fact a younger, teen version of Melody. How this works, I don't understand, considering a child Melody escaped from her astronaut suit in the 1960s, but it might explain the robots coming back to deal with time errors...
THE DOCTOR'S DEATH- Though you may not have noticed it, through fooling Amy that he was the Flesh Doctor in The Almost People, the Doctor managed to discover that in 200 years he invites Amy, Rory and River to see him gunned down by Lake Silencio. The sense of foreboding that comes with the knowledge of his impending demise is sure to hang over him in the remaining episodes, so expect that to be picked up here.
ANSWERS & QUESTIONS- Want answers to everything established in this season's arc? Tough luck, but Steven Moffat did promise that some more things will be revealed about River definitely, and elements of the arc will be expanded upon and/or resolved. But of course, when the Moff gives us answers, he raises just as many questions, so expect even more layers to add to the intricate story arc this week...
Doctor Who: Let's Kill Hitler airs this Saturday at 7.10pm on BBC One.