About greenlight games. How to know where developers will send steam key?

To Groupees. it will appear there, and they will warn you.

Probably to the bundle site.

If I recall, Desura has changed it's policy so that Steam keys will not be provided, if the devs want to do that then it's all on them. So they should be found from the bundle pages from now on. Best way to find out is to check the Steam community pages for the game.

Thanks for answers ;)