I confirmed with CDPR that the beta client is no longer under NDA, so I thought I'd post some screenshots (to start with) to give everyone an idea of what to expect. Images ahoy!
My default page: Installed Games. Some of these games are Steam, some are Uplay, some are GOG, etc. Everything installed gets shown here.
Every client or service has it's own bookmark created automatically when you link accounts. For example, this is my Uplay games bookmark
Every games list page has a really nice selection of toggles and switches, such as being able to select one or more genres, platform, ratings, OS, tags, or installed status
Every page also has a menu that lets you toggle how the display looks and sorting options:
Clicking on a game takes you to the game detail screen, which looks like this:
Clicking "My progress" at the top of the client takes you to where you achievements and game playtime is tracked as well as your rank among friends. Hovering over the achievement icon shows the date you unlocked it:
Here is the screen you use to connect accounts in the settings. You can see that many integrations are included out of the box, with support for manually adding others:
There is also a "features" tab that lets you toggle whether or not you want to launch each client along with GOG Galaxy, and/or exit them automatically:
Finally there is a "Recent" page that shows you your most recently played games, games recently played by others (popular games), as well as a summary of games added, achievements earned, and hours played. I have mine set to weekly, but you can also show this by monthly or daily:
Any game can be edited too:
You can also change the artworks:
Overall I have to say I'm really impressed with what's available so far and it's already become my "daily driver" for launching games. They have more features planned that will make it even better.
I've been playing with this for some time and have been working with their client APIs so I'm happy to answer any questions people might have.