When this whole thing broke, I was really, really happy that we had reached a cultural point where we would actually listen to a maid (an attitude in no way dependent on the truth -- we take powerful people seriously when they lie until it's proven in avoidable detail that they lied; social justice demands we do the same for everyone). It is in no way surprising that a case of this nature goes away (or looks about to, anyway) in a cloud of accusations against the accuser.
I have not read a ton of coverage of developments. This is a plausible summary:
Anyone who thinks DSK is going to be running for President of France will still have the Banon accusations to contemplate, however: