Even my Chrome problem has been solved. Now the Metro icon takes me to the Desktop Chrome, current session even and not a new window.
Edit: The whole confusion is caused by what default browser I had set, by the way. If I set Chrome as my default browser the Start Menu icon turns black and instances launched from it takes place in the Metro mode of Chrome, it's also worth noting that Metro IE is disabled in this case. When I change my default browser to IE, Metro IE is enabled and the Start Menu Chrome icon reverts back to pointing to the Desktop app, thus disabling Chrome's Metro mode.