From everything I've been reading, this ride will have quite high throughput with as many as 10-12 trains (with 14 per train) in continual motion. Load is supposedly similar to RRR where it's moving and you're hopping in as it continues to move forward. Load time is supposedly going to be somewhere between 20-40 seconds. The ride will have lots of slowdowns/stops at the different scenes followed by the many (6) launches, two separate forking drop-tracks to be able to get more cars through that section quicker etc.
Some estimates have guessed it could possibly have an hourly capacity of 2100/hour (which is more than the Hulk, well more than Gringotts, about the same as Spiderman and Transformers, less than Forbidden Journey)