Castlevania: Lords of Shadow - Mirror of Fate HD, also known as Castlevania: The Longest Title, is heading to PC later this month. Konami has already named Steam in their announcement, so no one needs to ask where they can download a copy.
Formerly a 3DS title, an HD update for Mirror of Fate came out for Xbox 360 and PS3 last year, in October. Although it's basically a companion game (and prequel) to Lords of Shadow 2, Mirror of Fate takes after the more classic Castlevania style, rather than the new Lords of Shadow action format. Consider it a mix of that and old school side-scroller.
As for where it falls into the Lords of Shadow franchise, Mirror of Fate takes place 25 years after Lords of Shadow, following the stories of Gabriel Belmont's descendents -- including Trevor and Simon. After their father goes all Dracula mode, the two set out to defeat him and avenge their mother. Yep, sounds like an average day in Castlevania.
No word yet on when Mirror of Fate HD will hit Steam this month, but March is halfway done, so the wait can't be that long. For now, check out some screenshots below from the PC version.