Apparently her grandsons didn't know about the Bond thing in advance so they can't have pressured her - and according to Danny Boyle she agreed as soon as she was asked, there was no "I'll think about it and get back to you" it was just "I can do that" straightaway. I just assumed her straight face was an attempt to keep a straight face - she's quite good at doing those. And I imagine that she wasn't at the closing ceremony because she'd been told it was all pop music - she's not known to be a fan. Prince Charles is doing lots of things his parents used to do, and William, Kate, and Harry are doing things he used to do. The Queen still does too much but she's the Queen, people don't often argue, lol.
The Hubble Telescope has just picked up a sound from a fraction of a second before the Big Bang. The sound was "Uh oh".