There is no difference between renewal cost and a new license. We normalized subscription prices many years ago; that change is not new. When we started offering monthly subscriptions (something like six years ago? maybe more), the price of renewals changed to match the price of initial purchase (but initial purchase prices mostly went down).
Prices have also gone up a little for the smallest licenses (which was announced was coming in 2020, but it took a lot longer to launch the new site than planned). For 10 and 50 domains, the price went up to $7.50 and $10 per month, respectively, from $6 and $9. I think the others are similar to their old prices (100 may have gone up 50 cents, not sure).
During the migration everybody that had licenses expiring got free extensions, so nobody would expire while it was still impossible to buy new licenses.
One of the reasons for moving to the new system is that we will finally have reasonably working email notifications about renewals, expirations, billing problems, etc. And, customers can manage everything about their own subscriptions (cancellations, upgrades and downgrades, etc.).
There are still a few bugs in the system, that Ilia and I are working out as we find them. And, I failed to bring over the old orders/subscriptions and billing info, which sucks. But, I basically ran out of time and money to keep pushing out the change. So, here we are, trying to get everyone over to the new system as quickly as we can.