Update, July 20: The nature of at least one of the three Dark Horse Comics teasers released the past couple of weeks is now apparent: the publisher is adapting Pan's Labyrnith director Guillermo del Toro and Chuck Hogan's The Strain trilogy of vampire novels to comics, according to a Variety report.Del Toro will be "executive producing" the comics, with a creative team of writer David Lapham and artist Mike Huddleston. The trilogy will unfold in 24 issues — eight per novel — and start this December. This would be del Toro's first official work in the comic book industry, though he's attached to ABC's in-development Hulk TV series, and directed both Hellboy films. "I supervise everything," del Toro is quoted in the Variety article. "I give my opinion on the art, the covers, the screenplays. [Lapham] is capturing the novel very well." The Strain was released in 2009, with the follow-up, The Fall, out last September. The third installment, The Night Eternal, is scheduled for later this year. Update, July 11: One week before Comic-Con International: San Diego, and we've got another teaser for something to be announced by Dark Horse Comics at the show's preview night on July 20. What is it? And is this teaser related to same project as the previous "Cast" image, seen below? Looks like we'll find out for sure soon enough. Here's the write-up of Dark Horse's Thursday Comic-Con panel: 12:00-1:00 Dark Horse: Fall Publishing Highlights— Three supersecret surprise megastars from the entertainment and publishing worlds (revealed on Preview Night at the Dark Horse booth) discuss their thrilling new comics at this special panel. Discover their spine-tingling new projects coming in fall 2011 and get an exclusive San Diego Comic-Con print, which you'll be able to see larger than life at the Dark Horse booth! Room 32AB Original Story, July 6: It's two weeks before "preview night" at Comic-Con International: San Diego, and the hype machine is in full swing. Dark Horse has been circulating this teaser for a project apparently (but not necessarily!) called Cast. We don't know what it is yet, but the image suggests that all will be revealed at 7:30 p.m. on July 20 — during Wednesday's preview night, where the convention center is open from 6 p.m. to 9 p.m. — in the San Diego Convention Center's booth #2615. Which, as the just-published exhibitor list tells us, is Dark Horse's booth. (It all makes sense!) The publisher is promising more teasers in the coming weeks before the event, which we'll have as soon as they're available. Until then, feel free to speculate wildly. Got a comment? There's lots of conversation on Newsarama's FACEBOOK and TWITTER!