Presumably close to Christmas. They're only announcing that the project exists so far. With its Noel theme, I can't imagine launching it any other time.

Full on original graphic novels from the big companies are still pretty rare overall, though DC Comics is certainly warming up to the idea a bit more after the Superman: Earth One hardcover hit last year to a lot of attention and sales. At the ComicsPRO event this week, DC Comics has a new original graphic novel in the works (not an Earth One tale though) for Batman with Lee Bermejo signing on to tell the themed tale. Bermejo is known for his work with DC Comics on titles like Joker and Lex Luthor: Man of Steel so stepping into a new Batman tale isn't all that much of a stretch. That's as an artist though whereas with this title, he's taking on the role of writer in addition to artist, making it his writing debut.
DC’s VP of Art Direction & Design, Mark Chiarello offered up this comment about the project:
“I’m TOTALLY excited by this project, and not only because Lee Bermejo is such an astounding artist. Sure, the work he’s done in the past (“JOKER” ogn, “WEDNESDAY COMICS”) has been pretty brilliant and I’d expect nothing less from Lee, but the added bonus of BATMAN: NOEL being drawn AND written by Lee is extra cool. In other words, I knew Lee could deliver the goods artistically, but I never knew he was also this great of a writer!”

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Presumably close to Christmas. They're only announcing that the project exists so far. With its Noel theme, I can't imagine launching it any other time.
When can we expect it?