Konami is teasing something on their Facebook profile. All they say is 'The Dragon Returns', marked with a May 31st date. We also get a teaser website, as well as the piece of art you see above.

The art style certainly looks like Castlevania to me. There was also a dragon boss in Castlevania: Lords of Shadow. On top of that, "Dracul" means "dragon" or "devil" in Romanian. If you have any other guesses as to what this is, share in the comments! Thanks to Jordan for the heads up.