Obviously this is all speculation but I think Cameron (and thus Disney) is going to force the same thing for the sequel. I wouldn't be surprised if 75% of the shows are 3-D.
I basically agree but I do think the Avatar sequel will have as big of a push for 3-D as any movie has had since maybe the first one. I expect Cameron will want the marketing to focus on the 3-D like it's a star of the movie and that will help bolster this movie's 3-D ticket sales. That being...