Based on Apple’s Indian site/specs:

In-ear sealed design with silicone ear-tips in five sizes (XXS, XS, S, M, L) for better fit. Apple+1
Active Noise Cancellation (ANC) claimed to be up to 2× more effective than the previous Pro generation. Apple+1
Adaptive Audio & advanced Transparency / Conversation Awareness features: e.g., the buds can automatically adjust between ANC / transparency depending on your environment. Apple
Built-in Heart Rate Sensing (for workouts) and Live Translation features. Apple
Battery life: up to ~8 hours of listening with ANC on a single charge (for the Pro 3). Apple+1
Case: USB-C MagSafe Charging Case, supports wireless Qi/MagSafe and has a speaker for “Find My” tracking. Apple+1
Connectivity: Bluetooth 5.3. Apple+1
Environmental/responsibility: Apple says the product is made using recycled materials, etc