Benedict and Martin did the first read-through as well.
Alas, Paul McGuigan is not directing season 3. Two other directors have been confirmed thus far.
Thanks to Sherlockology and Radio Times for many details of this post!
As you can see, fans have been visiting London lately, including some of my dear Tweeps. :D
Sherlockology has a great FAQ -- with season 3 right at the top! -- so if you want to know how to contact the cast, go read it.
Sherlock SEASON 4 is confirmed!!!!!!!