Restrictors are still just the 8mm same as before. They will ship with a T3 plug included. We had a chance to run the new motors over the weekend, they were still too new to make proper comparisons against the A52, our team drivers preferred to stick with their A52 after practice as they hadn't quite loosened up enough. I ran the A5 on finals day and liked it, the bottom seemed a little smoother than the A52 but still plenty low down and top end was good also, fuel economy didn't appear to be any better but as i said they are yet to fully loosen up.
Unsure about the B52 just yet, will have to drive it for myself, this was the tightest of the 2 motors,

The A52's were screaming, they were as fast if not slightly faster than any engine we raced against