Yeah, Aunt May couldn't blame Peter unless Gwen and her one last gasping breath said it was Peter... Try and get outta that one Pete! Yeah, but that could be true seeing as how she saw Peter in Carnage and suspected it was him from the get go.
I personally don't want him to speak. It would just turn out to be something hoaky that would pluck Pete's nerves. Something Ben would say, probably. I dunno, I think he's more menacing if he doesn't speak and remains silent.
Like I said before the menace of Carnage comes off better if he remains silent. Look at Sinister for instance. The first issue he appeared in I was like, "Man, he's really sinister," however, the second he was stuttering... Sort of upset but I saw why.
As terrifying as Carnage is, maybe that's not supposed to be his nature though. He is a clone of Peter, so they have to share the same feelings and Peter may have regrets for the clone who doesn't know any better.
I'm kinda dissapointed with the way in which Gwen was killed. I mean, it was cool and all, but I thought it was going to relate back to the bridge incident with MJ and The Goblin back in the Legacy arc. I thought we were gonna see Osborn throw Gwen off the same bridge and Peter catch her with his webbing, thinking he saved her just like he did Mary, only to find that she was dead. It would have been more devastating that way, him knowing that he had saved MJ and therefor should have been capable of saving Gwen too, but failed.
Ah well, Carnage is cool as well...