In the press release issued Monday by the Ender's Game production team, a Caleb J. Thaggard was listed for the role of Stilson. This came as a bit of a surprise since it had been previously announced that Brendan Meyer was playing the role - and he is as of this morning still listed as filming Ender's Game on IMDB.
It seems either Meyer has been replaced or someone made a slight error in the press release.
Keep checking back and I'll update this post as soon as we hear anything.Edit: And then we have this from today:
All very mysterious. :)