UPDATE: After the DC panel earlier today at the Heroes Con in Charlotte (full panel report below), would there be any news left for the later one at Wizardworld: Philadelphia? Well, we're about to find out.
DC Comics VP of Sales Bob Wayne emceed the event, and introduced panelists editor Mike Carlin, assistant editor Adam Schlagman, artist Dustin Nguyen, editor Eddie Berganza, associate editor Jeanine Schaefer, writer Jimmy Palmiotti, and artist Shane Davis.
First up is the Green Arrow/Black Canary Wedding Special by Judd Winick and Amanda Conner, where - you guessed it - Green Arrow and Black Canary get married. "You will not believe the end of this issue," teased Carlin. Wayne then plugged more matrimony action in the upcoming Justice League Wedding Special and Black Canary Wedding Planner.
Berganza than announced to the Philadelphia crowd the news that already broke in Charlotte - that Dwayne McDuffie, noted for his work on "Justice League Unlimited," is taking over the writing of Justice League of America as of issue #13 after the departure of Brad Meltzer.
Countdown was up next, with Wayne saying that the newly-darkened Mary Marvel will soon be "tangling" with Eclipso. The conversation digressed to Schaefer and Palmiotti joking about revealing images involving Mary Marvel's skirt.
In regards to Amazon Attacks, Wayne says that Catwoman will soon get involved.
The previously announced Wonder Girl mini-series - see the related Newsarama article - was briefly discussed.
Infinity Inc. and Suicide Squad, two projects talked about yesterday, were men-tioned again.
Palmiotti talked about the new Uncle Sam and the Freedom Fighters series, saying it will "dig into Phantom Lady in ways you guys won't expect," and subsequently acknowledging how dirty that sounded.
Wayne then talked about Superman #666, which appropriately enough will send Superman to Hell, and is drawn by Walt Simonson.
The new Metal Men series written and drawn by Duncan Rouleau and out in August, was mentioned.
Superman/Batman was up, with Nguyen saying that a lot of the Fourth World characters that haven't been around in a while, like Highfather, will turn up. This led to discussion of an upcoming arc in December, about the search for kryptonite, written by Heroes writer Michael Green and drawn by Shane Davis. Berganza than noted that Davis is now under exclusive DC contract.
Another comic reaching #666 - Batman - was briefly introduced, as was an upcoming arc of Nightwing where the title character is being "set up." A slide of the two-part Justice League/Hitman series by Garth Ennis and John McCrea, starting in September, got a nice ovation from the audience.
Palmiotti talked about Jonah Hex, and Wayne reminded the audience about the recently-wrapped Justice. Of the "Sinestro Corps War" in Green Lantern, Wayne said it would reference all the major DC storylines in recent years - "in a good way." Berganza spoke a little about Sean McKeever's upcoming run on Teen Titans, with Wayne vaguely hinting about some kind of possible "Titans Tomorrow" arc coming up.
The presentation was wrapped up with talk of yesterday's Flash news (the renumbering, Mark Waid, etc.).
The first question during the audience Q&A portion was whether or not Superman/Batman would have a permanent ongoing writer, and Berganza answered to give the rotating ones a chance, and Wayne simply said "No."
A fan asked if the Milestone characters and/or Archie super-heroes inhabit any of the 52 worlds, and Wayne said no, and reminded that they no longer have a license to the Archie characters they once used in their !mpact line.
The next query was from someone who asked, passionately, "Why did you kill The Question?" to which Schaefer replied "She's alive and well" (referring to the new, post-52, Renee Montoya ver-sion of the character). Wayne said the new Question will be in a mini-series soon, and that in October they'll be a trade paperback of classic Denny O'Neill and Denys Cowan Question stories, as well as an upcoming showcase of Metal Men comics.
A fan asked when All-Star Batgirl by Geoff Johns will come out, with Carlin sarcastically asking "Why should All-Star Batgirl come out? None of the other ones do." Wayne then said they learned their lesson from All-Star Batman & Robin and All-Star Superman to have a few is-sues in the can before anything is released, so they can "disappoint you in the middle of the story instead of the beginning," he joked.
Palmiotti was asked if any other classic DC western heroes would pop up in Jonah Hex, and Palmiotti answered that El Diablo and others will show up in this year's Halloween issue.
Anything new from Mike Norton? Carlin answered that he's the new artist on The All-New Atom.
Upcoming comics project from Brad Meltzer? Carlin said that he's back working on his novels, but they're always willing to work with him in the future.
"When did Jimmy Olsen become privy to so many of the secrets of the DC Universe?" Carlin said that there was indeed a reason for this, and to keep reading Countdown. This led to talk about the "Jimmy Olsen must die" teases for Countdown, which digressed into joking about characters coming back to life - ending with Wayne sarcastically stating "but Captain America, he's never coming back."
A fan asked if Azrael will ever be seen again, with Wayne succinctly stating "Oh, that's funny."
Two questions asked by the same guy - "Will there be a new Andy Diggle project announced soon" and "will we see collections of Superman Confidential and Batman Confidential," and the answers to both were very simply, yes.
The panel closed with what has become tradition at DC panel - the distribution of promotional pins.

[this Flash image is the actual cover of The Flash #13, the final issue of the current series, and comes to us from Heroes Con].