GOG has announced GOG Galaxy 2.0, a massive overhaul to their current client.
Galaxy 2.0 aims to be your new, one-stop PC gaming client. It will allow you to link any of your gaming profiles, even console ones, to create a unified library, friends list, stat spreadsheet, and social network.
It will allow you to launch any PC game you own through the client, and offers cross-platform chat features. You can read more about GOG Galaxy 2.0 here.
Gamers can now sign up to test the beta version of the client. No final release details have been announced.