Likely to be cancelled:
Justice League spin-off
Really, just take your pick from the above. I don't think they will cancel that many titles at once, cause I can't imagine they have THAT MANY new ongoings just waiting in the wings, but all those titles are performing badly and no one seems to care about them (relatively speaking). None of them are really critically acclaimed or anything. With Firestorm losing EVS, I've gotta imagine it's on shaky ground too.
For new series:
Some teen book. Static and Hawk and Dove were already cancelled, Legion Lost and Blue Beetle don't seem long for this world, and I expect Ravagers to perform horribly. That just leaves Teen Titans and LOSH, so if they want the Young Justice line to survive they have to try to get something going there.
Doom Patrol? I don't really know anything about them but the Dark line has been on fire and this certainly fits in with the 80s / 90s Vertigo basis of the Dark line.
I had thought of Brave and the Bold the other day so I agree with that. A classic DC property. Team up books don't really sell too well so they'd need some kind of unique hook for this.
WildCATS. I have no interest but they launched Grifter and Voodoo for a reason so this is to be expected.
Perhaps a book for one of the Trinity of Sin.
Cyborg. I'm not really interested but again, it's to be expected.
I could also see another Superman title (in addition to Action and Superman). Action and Superman both sell well, and with four Batman titles, I could see a third Superman title. Maybe they could have Superman be the "constant" of Brave and the Bold.
Maybe another genre book. They've done war, horror, western...I Vampire is sort of a romance book...I could see another genre title.
I think they will wait longer to launch a Shazam book. It will probably roll out of Trinity War.
For creative team switch-ups:
Both Green Lantern New Guardians and Green Lantern Corps. I would not be surprised to see these two titles cancelled but immediately relaunched with a different concept (i.e. maintaining the number of GL titles at four).
JLI, obviously. I hope they don't go with Didio. Another title that I could see being cancelled but immediately relaunched with a slightly different hook.
Superman, just cause it's been rumored.
I think the Dark line stays all the same.
I could see Stormwatch getting changed, if they have any big plans for that book in the future. I just don't see Milligan as a guy connecting with the typical DC fan right now. The New 52 is more plot-driven than character-driven, and Milligan is the opposite.
I can't recall who the artist is on Suicide Squad, but I could see that title getting an art upgrade since it performs fairly well but had pretty bad art for most of its run so far.
DC will cancel all the low sellers, anyone who thinks different are kidding themselves. the ones to go next have been mentioned several times on this thread already.
as for replacement titles, i'd be surprised if Lobo and The Question aren't among them, since they've both been already introduced in the NuDC universe. New Gods is also a likely bet since it's a fan favorite.
As for Captain Atom, I think the only reason it got spared the first time, and Hawk and Dove got canceled instead, is because DC decided Liefeid would server better on other books, and that Hawk and Dove would drop like a rock without him.
Not to hijack but what book did The Question show up in?
Torn on the properties being discussed for the relaunch as none of them really inspire me, though I'd be kind of sad to lose Voodoo. It isn't as interesting as when Marz was on it but I've still enjoyed reading it.
I knew I'd bury you one day, you sanctimonious, self-righteous pain! -- Lex Luthor
Black History Month & 29 Days in February
I'm not sure which will actually get cancelled so I'll list the ones I wouldn't mind seeing go.
Voodoo (which is a shame because I really liked it for the first six months)
I would like them replaced by
Trinity of Sin (I like what I'm hearing about them)
Lol at people ALREADY saying GI Combat. No matter how bad the thing sells, I do not think it (or Ravagers) will be cancelled after one issue has been released. If for nothing else than to save face.
I suppose at the absolute worst they could pull the ol' Marvel "pretend like an ongoing was actually a miniseries all along."