It's Platinum Games' original stylish action game on PC, at 60fps with 4K resolution support. This is not a remaster mind you; there's support for higher resolutions, but the textures and character models are the same. Keep your expectations in check!
To sweeten the pot a bit, Sega is offering the Digital Deluxe Edition of the game for free to everyone who buys the game before April 25, 2017. The Digital Deluxe Edition includes a 5 track soundtrack sampler and an improved version of the digital art book from the original Climax Edition, with even more artwork.
"We are dedicated to bringing high-quality, best practice PC conversions of our back catalogue games to our fans, and Bayonetta was a great fit," said Sega Europe senior vice president of Commercial Publishing John Clark. "Bayonetta is one of the most often requested PC conversions of our games, so finally being able to launch it on Steam is fantastic. There's more to come!"
Hopefully the PC port of Bayonetta turns out better than the PC release of Nier: Automata. Same developer, different publisher. The PC version of Nier: Automata was launched with a broken full-screen presentation, visual stuttering, badly rendered cutscenes, and a host of other issues. Hopefully, Sega and Platinum Games have taken the time to do this right. Update: Veteran mod guy Durante has taken a look at the PC port over on PCGamer and given it his a-okay.
Bayonetta follows the Steam re-releases of Valkyria Chronicles and Typing of the Dead. Unfortunately, we're unlikely to see Bayonetta 2 on Steam anytime soon, as Nintendo was the one that stepped in to fund that title.