Lucid Games is a British video game development studio formed from industry professionals and the former Bizarre Creations senior management team that managed and developed the Project Gotham Racing games.

On its Facebook page we can read this:

So yeah, Mid-May will be interesting for the studio. We have some exciting updates coming. Stay tuned!

Project Gotham Racing 4 Rumor: PGR5 to be announced on 21 May. | VGLeaks 2.0

Next Xbox/Durango presentation is scheduled for 21 May, so this “mid-may” tease from Lucid Games could perfectly be related  to Microsoft’s event.

Remember, Microsoft owns the PGR intellectual property (IP). We talked some time ago about the possibility of this announcement happening.