Amazingly, I found very few links that had no spoilers at all.
Except that the one is the 2013 Sherlock 'Meet The Filmmakers' and not today's. That's just Steven and Sue.
Heading home after a very entertaining reflection on #Sherlock S3 with cast and crew at the Apple Store. Recording will be on iTunes soon.
— Sherlockology (@Sherlockology) February 4, 2014
However, the 2014 Applelock event held 4-Feb-2014... has Amanda, Martin, Ben, Steven and Sue. S3 spoilers inside this link from The Mirror! Check out tumblr and Twitter for pics and (other) quotes.
Soundcloud of a s3 podcast Q-and-A that included Amanda and Lars [CAM], director Nick Hurran, plus Steven and Sue.
Audio: @bafta #Sherlock S3E3 Q&A featuring @CHIMPSINSOCKS , Lars Mikkelsen, Nick Hurran, @suevertue & Steven Moffat: http://t.co/BRNvWiN9YI
— cumberbatchforum (@cumberbatchfrm) February 4, 2014
Bonuses: loving but spoilery review of His Last Vow at Cumberbatchweb and of The Sign of Three too.