Saw this blurb at SDCCUB, but a Publishers Weekly article gives a little more insight about who's coming and who has opted out. Along with news of new publishers making their debut.
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LoginOut: Already we knew WB/DC, but they confirm Dark Horse will not attend (something that was more rumor but this seems more official now) and also Drawn and Quarterly will be absent for the first time after attending for decades.
New: Immortal Studios, Interpop, Tapas Media/Wuxia World, Three Worlds/Three Moons, and Z2 will make their con debuts. Not too familiar with them, but should be interesting to see what they have. Toei Animation (home to DBZ and Sailor Moon among others) will also be there, which I think is their first time.
Still Going: They confirmed G4 is there along with Comixology, Top Cow/IDW, Fantagraphics and Image/Skybound (although the article indicates their booth will be smaller than in past years). And we knew about Funkoville (which the article calls Funkoverse) but they note that it'll be big. Also, activations outside seem to be confirmed to be on track with what we saw in years past.
While we wait for more info, I am heartened by the news of new blood and some returning favorites. Can't wait!