It could mean, "Aww darn, Benedict Cumberbatch is officially off the market"[*](Not that I honestly deluded myself that I had any sort of shot with him anyway, just to be clear.)
Or it could mean, "Aww, their announcing it in the newspaper like regular people is the classiest and most adorable thing ever!"
In all sincerity, I wish them every possible happiness...
...but not without a wistful sigh.
(By the way, I wonder who he will choose to be his best man. Because whoever it is will have a tough act to follow.)