The blogosphere was still reeling from the revelation that Peter Jackson - as well co-writers/producers Fran Walsh and Philippa Boyens - are moving ahead with a third Hobbit movie, when reports began circulating about some possible titles for the film (based on domain registrations by Warner Bros.).
It appears Jackson's first Hobbit movie is sticking with the original subtitle, An Unexpected Journey, based on a couple of freshly-unveiled ads for limited edition RealD 3D Hobbit glasses. Things are in motion right now, so there's no guarantee the second installment, currently subtitled There and Back Again (the alternate title of J.R.R. Tolkien's source novel) will do likewise.
There and Back Again could swap its subtitles with one of the newly-registed options (The Desolation of Smaug and Riddles in the Dark) since it has a conclusive air befitting the third Hobbit film. That's assuming the trilogy finale continues the story of Bilbo Baggins' adventures, rather than serve as a linking bridge between the two Hobbit movies and Lord of the Rings trilogy (based exclusively on 125 pages of appendices published in Return of the King).
TheOneRing.net is confirming a third possible subtitle, The Battle of Five Armies, offering further "proof" that the central Hobbit narrative thread carries on through to the final chapter in Jackson's second Middle-earth trilogy (all three prospective subtitles reference key events in Tolkien's book).
On a related note - check out the above-mentioned The Hobbit: An Unexpected Journey RealD 3D glasses below (click either thumbnail for the full image):
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Riddles in the Dark seems the least likely option as a subtitle for either the second or third Hobbit movie, if only because the event it alludes to - when Bilbo (Martin Freeman) encounters Gollum (Andy Serkis) in the goblin tunnels - takes place in An Unexpected Journey (we're basing that assumption on the fact that it appears in the film's teaser trailer, and parts of that scene were included in the sizzle reel Jackson showed at The Hobbit's Comic-Con panel).
Then again, as mentioned before, Jackson has been somewhat vague about how much narrative material (and footage originally intended as part of the first two Hobbit movies) is being spread out to serve as the foundation for Hobbit 3. Screen Rant will keep you updated on the situation, of course.
The Hobbit: An Unexpected Journey opens in 2D, 3D, and IMAX 3D theaters around the U.S. on December 14th, 2012.
The Hobbit: There and Back Again (not, for certain, the official subtitle) opens in theaters on December 13th, 2013.
The Hobbit 3 (not the official title) reaches theaters in Summer 2014.