It's still an A346 on their booking engine. And I'm flying on IB3203 BRU-MAD with confirmed business class seat, so I think it'll be an A346 indeed.
Best regards,
Ivan
Yes they are. I have a seat on their first BUD-BRU flight
Flew with SN from BRU to FRA and back yesterday (Tomorrowland). The safety video was still narrated by Ray Cokes during both flights.