Two new options have been added to Settings > Subscriptions.
You can now limit the available payment methods for each type of Subscription.
And if you are using PayPal then you can setup a Trial period, where you can discount (or even increase) the price of the first subscription invoice.
Screenshot:
The above settings will generate an initial discounted invoice followed by normal priced subscription invoices:
When paying by PayPal it shows the discounted rate first: