Adeona wrote: Well, aside from the casting announcments, we've had no indication of Coriakin or Ramundu's Daughter being in any scenes. And we don't even have that for Ramundu himself!
Well, the casting announcements in themselves are plenty enough proof that Coriakin and RD will be in the movie (plus we've seen sets for Coriakins Garden). Maybe we should be slightly worried about Ramandu himself, but the difference between him and Peter/Susan, is that we already know the actors playing them, so we can easily look for signs as to whether or not they may be involved i.e. reports/photos of them being in Australia, quotes from actors/producers hinting at their inclusion, etc.
Maybe it would not make the most sense as far as storyline, but as Salem said, they were such main characters in LWW and PC that it would be stranger for there not to be a scene with them. Otherwise, to the non-fanatical movie audience it would seem like the elder Pevensies just dropped off the face of the earth.
The fact that they were main characters in LWW and PC would be the biggest reason
not to include them in my opinion
. To stick in two big characters like that and then not do anything with them for the rest of the movie would be far more confusing to the audience than not inclduing them at all. The example glumpuddle often uses is of The Scarecrow's appearence in The Dark Knight. He was the main villain in Batman Begins, but then only appears for like 2 minutes at the start of TDK. The main reaction from viewers tends to be "what was the point in that?"
Though as Fantasia Kitty said, the production don't seem particuarly averse to trying to shoe-horn in characters which arent appropriate, and they've done plenty of things in the first two films that i thought were mistakes, so there is nothing to say they won't include them.
Either way though, whatever our personal views and speculation on the matter (we're all likely to have vastly different views on the issue) i don't see their being any basis to make it a "rumour". Even if we all wanted it, and even though its technically a possibility, we dont have any evidence from which to make any assumptions from at this moment.