"The graphics are different, obviously, platform to platform, but in a connected world, the game of Destiny is going to be awesome on all of them."
you seem to read this as if it says:
"Their are obvious differences between the graphics, platform to platform, but in a connected world, the game of Destiny is going to be awesome on all of them."
the differences are not being called 'obvious'. Bungie are saying it is obvious that there are differences.
they are also not saying:
"The graphics are different, obviously, generation to generation, but in a connected world, the game of Destiny is going to be awesome on all of them."
the graphics are different platform to platform, means the graphics are different on different platforms. and of course they are, because that is always the case. IE it is obvious that they would be different.
hopefully that makes it easier to parse for you.