The BBC One British drama trailer aired today, 1-Sept-13. Note that it is a medley of shows, not just BBC Sherlock. Distracting!
I'm sure fandom has been madly creating screen caps. When I find 'em, I'll update in a later post. :D Radio Times mentions one snippet of dialog.
Sherlockology has a great update about the wrap of filming s3. Post-production time! All s3 filming is now over; if you want setlock, it should be all over tumblr, Twitter, and elsewhere.
As Sherlockology also reminds us, still no air dates for s3 yet.
ETA: Updated air date news, short version Sue says NOT November. Just not. Yes, this post's from 20-May-2013, but again, Sue's the producer, and she would know. Thanks to Final Problem for this info!