If the opening story is to feature Davros, then we'll see him as a boy and then also as a Dalek-cripple-monster - from different times. Likely the boy will be more prominent in
The Magician's Apprentice, and then the pay-off will come from the older one being in
The Witch's Familiar.
Whithouse's first episode is
Under the Lake, then his second is
Before the Flood - what if the flood in the second episode is what causes the lake to form in the episode before it?
We then have
The Girl Who Died and
The Woman Who Lived. This again hints at some kind of out-of-chronological-order kind of story-telling.
Once more,
Invasion of the Zygons and
Inversion of the Zygons hints at this also. An 'inversion' is the point at which a concept, relationship or event turns in on itself - a reversal of order. An inversion of their attitude, or their relationship with humanity as per the 50th anniversary would surely happen before the invasion?
Sleep No More and
Face the Raven is a bit more obscure, though if both were to be indirectly referencing death you could make a contrasting link out of them. If you take them literally as instructions, then to 'sleep no more' would suggest that you shouldn't die, whilst to 'face the raven' would be to accept your death. Both sleep and ravens have some loose tie to death but this is the one where I'd arguably be reaching for an explanation the most I think.
Then there's the finale episodes
Heaven Sent and
Hell Bent, which again could be seen from different perspectives. We know that one of the episodes is to be focused heavily on the Doctor himself at least. We know from the trailers repeatedly that he is the Doctor and he likes to "save people"...that seems to be the big crux of this year so far (with last years 'am I a good man' getting a pivotal mention in many early trailers). What if this is again a perspective thing with those he rescues seeing the Doctor as someone 'heaven sent' to save them, whilst in contrast the Doctor is 'hell bent' on saving them... possibly tying in heavily with the idea that Clara is leaving or may even be at risk of death in the finale.
Whether these concepts could play into the episodes, or are just a nice bit of wordplay I have no idea. But it's just some random thoughts I had at 1am