I noticed there is now an option to link to Steam along with the other app stores. Cool! When I put the link to my games in though, I don't see any Steam link on the page. The example URL in the box looks like a Greenlight URL, perhaps it only works with Greenlight but it would be cool if you could link to games or DLC on the Steam store. Example link: http://store.steampowered.com/app/409370.
Steam links not showing up
I'm having the same issue. In the field "Steam" link under "App store links" inside of "Edit Game"
The issue becomes clear when you see this side-by-side:
Since it's listed with all the other options, we assume it's also suppose to show up with an icon on the page.