I can only pray that they are talking about a motion capture performance, like for Gollum in the Lord of the Rings or Tom Hanks in Polar Express.
If they are talking Crispin Glover in a suit, I don't see how that would work. I don't think an audience will want to see that.
Hopefully, Zemeckis will make this interesting and do justice to the original text rather than have explosions and chase scenes.