Do note that at this point, this is just an unconfirmed rumor. A staff from Konami China posted on his Sina Weibo (Twitter equivalent in China) earlier today, seeking server programmers for a new cross-platform online project. He attached a Castlevania poster to this post, which was re-posted by Konami China’s official Weibo.
The attached poster is from the 2005 PlayStation 2 and Xbox game, Castlevania: Curse of Darkness. Seeing that PlayStation 3 failed with its certification in China recently and no other consoles have been approved, 1 can only imagine that the Castlevania Online project is for the PC and mobile devices. Of course, it is still a rumor at this point of time.