Yeah, I doubt either of those is true

.
Quite often, characters aren't to be considered truly 'dead' unless we see a dead body, or other first-hand concrete evidence of their passing. However, with both of these players, we
did see a dead body being loaded into a coffin - so, I don't see either of them coming back from that

. (Indeed, if either of them
did come back from that in series 2, then it'd just cheapen future deaths where we see a dead body, because I'd be left wondering if
they would be reversed!!!)
With that being said, I do hope we see more of these characters in some form - whether it's in flashbacks; some kind of posthumous appearance (e.g. as ghosts); or even just their long-lost twins

!!!!