Iron Man director Jon Favreau gave MTV an update about the anticipated movie:
There’s a lot of effects work that’s going to be happening in the next six months. The movie is pretty much going to be everything that it’s going to be by the end of January. Because so much of it is animated and CGI you have to turn it over and let those people do their work on it. So we’ll be done in about a month with all the big creative decisions. And then the rest of it becomes about scoring and sound design.
There’s more at the link above, from the running time to the possible cameo appearances.
Source: Advanced Dark