Trish Q would be a good swerve, but I think she may be being set up to actually be an ally. She was leaked the Luthor/Lois picture and has been fed "rumors" of Lois & Superman. That could be part of an attack on Superman by Talia if this is all connected. We saw that one person taking a cell phone picture of Lois & Superman embracing on the street, so that's out there. That cell phone guy was too prominent to be a throw away gag. But Superman saved Q's life after she was attacked by someone angry over some presumably poorly sourced rumors. I think maybe when those picture surface she's been put in a place to make the choice to not run them and based on Superman's treatment of her chooses not to.
The clues for Robinson Goode are so obvious that they almost have to be misdirection. She arrived at the same time and was brought in by Mr. Strong's ("Mr. S") boss. Same has been said about Red Cloud. Her eyes turned red when Candy was killed in the bar by Red Cloud. Bendis has said Red Cloud doesn't think she could go toe to toe with Superman and will be surprised that she can. In that sense, Robinson looking for Kryptonite is explainable even if she is Red Cloud, as she didn't think she could handle him without it and wanted the insurance.
Going against that theory, when Candy was killed Robinson was somewhat taken aback, her "whoa" when the Red Cloud was taking out Candy wouldn't make sense as she'd killed multiple people in that same fashion already. The Kryptonite, because she's a meta. And Red Cloud seems to have a direct line to Strong that Goode's behavior in the meetings with him wouldn't really synch up with. Cloud seems to have a more direct connection to Mr. S and their leader, presumably Talia.
Melody Moore has similar connections, but less obvious ones. She arrived in Metropolis at the same time as Red Cloud and Robinson Goode. She has an alliterative name, Lois Lane and Lana Lang and everyone assumed she was a new love interest, when Lex Luthor has the same naming convention. The biggest clue for Melody Moore is that she found out from the kid with Superman about the "bald guy" setting the fires and then Mr. S and his boss immediately knew about Yogurt as well. That scene was written make is seem like his confession is what doomed him, but Strong says that his boss "heard" about Yogurt already. Then Red Cloud appears and kills him. Cloud also appears pretty tall, which would track with the big deal made of Moore's height. Though that could be explained by her powers.
So, my money is on Melody Moore, even though I think most of the obvious evidence points to Robinson Goode.
I also think Cloud is going to go after Lois as well in 1006 either after the photo of her and Superman surfaces or it gets passed along to Strong by Goode. The solicit for 1006 that she targets someone close to "Superman" and that photo would place Lois squarely back in the target zone of "Superman's Girlfriend." If that's true, Bendis has said the Damsel in Distress version of Lois is the worst incarnation of the character, so I wouldn't be surprised if Lois takes out Red Cloud herself. And with her new enforcer dealt with Talia shows up as the Planet's new owner. Alternatively, Melody Moore could be the target since she's only interacted with Superman.
Also, anyone think it's possible that Lois is now the Planet's new owner? It'd be completely out of left field, but maybe she came back with some space money and bought it out? That'd have ramifications for both Clark Kent and Superman.