Seems to me that the Mercedes relationship still works (electronic stuff) but the engine deal is broken so far. Heard this from an AMG engineer. There's maybe be a last chance to heal. But do not have any further details... everyone I know does have sealed lips.
Heard it the first time at the Engine Expo held in Stuttgart last month, which is just around the corner of AMG headquarter. Since then it has constantly been repeated by insiders... maybe rumors but in every rumor there is a little bit of truth.
