We've just added another 10,000 users from the Steam Trading Group to the beta - emails are rolling out now.

If you receive an email, there is nothing you need to do, just go to your Badges page to see which games you can earn game cards for. You'll also have 3 more invites in your inventory that you can share with friends.

We know there are many more users waiting to participate, so if things are still looking good and stable we'll roll out more invites in a few hours.