"Dev Kit" for what, exactly?
A regular PC is not a console dev kit. A console devkit is essentially a regular game system with a second PC attached to it hosting it, and you connect to that second PC to control the game console. You must be a registered developer working at a game studio in order to get one from the console companies.
I'm looking to do a console game. But for starters I'd like to have the demo done for PC. I want a playable demo for PC.