This is hardly the first indication of a sequel to 2010's Castlevania: Lords of Shadow, and it seems likely that Konami is once again working with Spanish studio MercurySteam. One employee posted the teaser image seen above to his website back in late January, specifically pointing out the connection to Konami.
Another staff member, taking to Spanish radio (via Eurogamer ES), mentioned his involvement with a sequel in late 2010 (though it's possible he was just riding high on the first game's then-recent debut). Konami's official line on the matter is ... well, nothing. The publisher hasn't made a peep regarding a new Castlevania.
Regardless, with PAX East just a few days away and the upcoming preview season, we expect it won't be long before Konami's tune changes. We'll keep an eye on Cox's Twitter feed as well, just in case.