Not really a big deal if true. Nolan re-wrote the script when there were script problems last year. As JacksonArcher stated, if this is indeed true, they have a whole year to fix whatever the problems are. Also fans have already been critical of Snyder's selection as director, so yes if this turns out to be disappointing again they're criticize him, just as Bryan Singer got criticized for "Superman Returns".
I'm personally looking forward to the SDCC Panel and possible footage coverage. I'm also betting that the teaser trailer will be attached with "The Dark Knight Rises".