Hi, the Super Bundle only includes all games up until when you buy it. Whenever we add games, the Super Bundle price increases too. Sadly, itch.io doesn't support a "complete the set" bundle like Steam does, so you can't get just the new ones in a bundle. We do also have bundles of 8 at 25% off.
If you want to get the new games as they come out too, the best way would be to subscribe to the Patreon. Hope that answers your question!