Unfortunately, it's not L-410 anymore, this year it's a Saab 340. However, the flights take place only on Tuesdays and Thursdays, and baggage limitation is unclear - operating carrier advertises 13 kg checked baggage, but when you purchase a ticket as a codeshare through Croatia Airlines, baggage allowance is 23 kg. There was a post on FT recently about someone asking about actual baggage allowance when booking the codeshare - maybe we'll find out soon
The summer schedule for those flights hasn't been released yet, but since they're PSO flights, I doubt there will be much change. I'm planning to travel RJK-SPU in the summer on it, so I'm eagerly awaiting summer schedule being loaded too.