The information was from Amazon Spain's listing, but got taken down, so take it with a grain of salt
New QN3 chip
30mm drivers confirmed
12 NC microphones (probably 6 per side)
Up from 9 in the WH-1000XM5)
6 AI-powered voice microphones for clear and noise free voice calls
Product release May 15
Auto NC Optimizer still present
Foldable design
New case, with a magnetic closure for quick access
Lightweight - 250g (similar to WH-1000XM5)
New headband is even more comfortable and secure than the previous model, with soft, padded ear cushions for a premium comfort feel
Up to 30 hours of battery life
3 min quick charge provides up to 3 hours of use