I believe John did a beta of Exit Path a couple days before it was the full version: except he uploaded it directly to the game list.
Game developers are that: game developers. They have powers similar to a mod, which means that they can sticky their threads and such; I believe they would use this power to provide any updates to their game. If any developers wanted to have users beta test their games, they would do so in the Programmer's forum, while providing updates or they would directly beta the game in the database.