Wow, where to start? Forerunners weren't always mysterious, there's a book series about them for crying out loud! And it's been hinted that they aren't extinct ever since Halo 3. The Didact isn't dead, we just saw him fall into portal/beam thing, and we hear him narrating the epilogue, which automatically proves he's still alive. And the Chief doesn't need to stay faceless because Bungie has already given us a description of what he looks like. You gonna trade in all your Bungie games too? People have always wanted to see his face, and when the get a small glimpse, they go ape-s&!@ crazy. And at least 343 cares about the Halo universe and is incorparating the novels into their games, something Bungie didn't give a crap about. So while all these things may seem outrageous to you, I personally find it as a plus for the series. It's about time John showed his face.