The biggest changes are:
1. Instead of having unlimited time to report an unauthorized transaction, I only get two months. And yes, there are situations in which this is useful.
2. SEPA authorizations to charge an account work by a three-way (bank + charger, charger + account holder, bank + account holder) handshake instead of a two-way handshake (bank + charger, charger + account holder). To get around this, the AGBs say that the bank assumes that I authorized all charge transactions unless I complain about a particular transaction. In short, I have to work things out with the charger instead of forcing the bank to undo the errant booking.
Both changes are very nice for businesses as it severely restricts what the end customer is entitled to do in the case of an error. That, of course, is not what the informational cover letter accompanying the AGBs say…