Hopefully we'll get some nudity in Casino Royale. 'Grittiness' to me implies a certain honesty in the way scenes are shot. The 12A certificate can push things surprisingly far.
Actually, I just wish they could release an unflinching, unrated (15- or 18-rated) version of Casino Royale on DVD alongside the theatrical version.
I certainly hope that if they do cut to achieve the 12A rating that they'll do a directors cut on DVD - not so much for nudity as for the violence.