I may be lost, but how did you get that they were killing off Carol from just what happened in Dark Avengers #1.
Osborn replaced her with a look-a-like yes, but I keep getting the impression that it just meant she was going to go "Rogue" and join up with the other Avengers.
Granted I haven't been reading her solo title (I'm really behind.)
But unless this was announced somewhere else, I'm still having trouble leaping to ger death based on Moonstone masquerading as her.
I just found this over at Newsarama so I'm guessing this is the story the OP was initially referring to.