How will the subscriptions handle product price changes?

The auto-charging subscriptions will generally keep the price from the initial order (if there wasn't any specific subscription discount code used in the initial order). However, we do have a functionality, which allows you to automatically propagate any price changes to your subscriptions. This functionality can be turned on in Seal Subscriptions > Settings > General Settings > Auto-charging subscriptions settings.
The recurring invoice subscriptions have an option to keep the price from the initial order or use the newest product price. You can change this setting in Seal Subscriptions -> General Settings -> Recurring invoices settings.