The update for BBC Discover is currently being rolled out to all users, but due to the high volume of users it will take some time to reach everybody. You should receive it by the 6th of July 2023.
You will see the update in the plugin to version 1.7.0 before the content reaches your account. This plugin update will visually feature piano, but the content will be missing until the update becomes available on your account by the end of next week.
Please give it some time to appear in your account, at which point you will get a content update that contains the piano samples for BBC Discover. If you haven't received the update by the 6th of July, get in touch with us at www.spitfireaudio.com/support