Interestingly, JK just gutted their entire pricing structure (recently, I just noticed it today). Gone are the economy, economy +, avant, and business options. Now it's Traveler, Traveler Flex, and Premium. The first two are identical except for flexibility, and the last is full-on business class with a blocked middle and double points. For my flights, premium class was also about 60€ cheaper each way than the older business class.

I see they are still selling the comfort option on the other two fares, and they have an option to purchase lounge access for 25€ as well.