These are the kind of announcements that make gaming so great. After (not so subtly) using a Bayonetta update to hint at a Vanquish PC port, Platinum Games officially pulled back the curtains and confirmed the game's existence. Like, Bayonetta, Vanquish will be sold through Steam and both its page and pre-orders are officially live. Coinciding with the announcement was a reveal trailer, which you can see below.
Vanquish's PC port will retail for $19.99 and come with all of the game's DLC as well unlocked framerate and resolution. It's also worth noting that if you own the previously released Steam version of Bayonetta, you are eligible for a 25% discount on Vanquish. It's not clear whether or not the discount applies to pre-orders only, or if it is permanent, as there is no end date/time in sight. That said, common sense dictates it's probably just on pre-orders.
The Vanquish PC port will release later this month on May 25th, 2017.
Source: [Steam]
