With Pro and Tracks you can download music and sample packs (with discount) from the past 30 days and future releases.
You can find out which packs are included using these methods:
Go to the release you want to check and watch the +Tracks and +Pro price.
If it's free it would be available for free if you register today:
Sample Pack example:
Music release example:
2) Hover on the + Tracks or +Pro icon and check the deadline date.
Once you logged in as a Pro user you will see the +Pro signs. This will mean the product is included in the Pro subscription. It's either free or a discount will apply (depends on the products.
Once subscribed you can click here to find all free products: