Konami has launched a new website teasing an announcement on May 31st. Clues from the site suggest that the site is related to Castlevania: Lords of Shadow. Could it be a sequel to that game?
The site, entitled "The Dragon Returns," shows an ornate wooden door with a golden dragon in the middle. Dracula means "son of the Dragon." It seems likely that this is a Castlevania game, then.
"Dare you face the evil darkness? It is written that the creatures behind that door will return very soon to claim the souls of your loved ones, and send you straight to hell! Be aware!" reads a line from the source code description.
The source code also calls this site the "CLOS Teaser Page." CLOS could be meant as an abbreviation for Castlevania: Lords of Shadow. Not the most definite proof ever but when added to the other evidence...well, a Castlevania game seems likely.
A rumor from earlier this week suggested that Lords of Shadow developer MercurySteam is making a 3DS game entitled Castlevania: Mirror of Fate. That 3DS title could be what they're teasing here. The hint at Lords in the source code makes that seem likely to me.
However, there's no mention of the phrase "Mirror of Fate" anywhere on this site. It could be that this site is teasing something other than the rumored 3DS game. Perhaps another Lords title is coming to consoles.
Not much else we can do except wait for the announcement. Fortunately May 31st isn't too far away.