I am also curious to see how they will deal with the whole "the great detective as a fraud" angle. At the end of the RF they obviously let this lie be accepted by the wide public, judging by Mycroft scene in the club and John's words at the cemetary. However, scruffy Anderson is obviously eaten by remorse: by remorse because he believes he led a man to comit a suicide or because he also learnt his accusations were false? In any case, Sherlock will need to clear his name before he will be able to reopen his practice as a consulting detective again. Just curious....