I'll hang onto the D3S for the foreseeable future.
My DP associate (a perfunctory, from Japan technical savant) still claims the D3S is preferred for Weddings, not sure where he gleans that but he repeated it last week when we were divining his (A99/Sony-Zeiss) shots and mine (D800/Nikkor) from a drive through the Santa Monica Mountains.
It is reliable in concert and club settings and albeit at 12+ MP, is more forgiving.
If/when, a D4S arrives at 24MP perhaps then I would hand it off.
I believe that Perrone has a similar opinion about that, but I'm going off of memory as to where he may have indicated that. If I am incorrect, then forgive the mistake.