It wasn't a big reveal and I don't think they meant for the 'news' to be that Sherlock is still alive.
The way I read that teaser was that Sherlock knows he has to, at some point, let all the people in his life know he is in fact alive. His expression in the last shot indicated that, IMO, in a 'This is going to be REALLY hard' kind of way 
I can't wait.