Final stats for update 8.3 have been added.
The TOP20 best performing tanks list has undergone some big changes.
AT 15A has taken the top position - maybe the armor highlighting change has helped it and other well-armored tanks?
Predator Ultramarines is 4th after the usual T28 Concept and Object 252U. I have never played it, but I have always regarded is as an average tank. Maybe the armor-highlighting change in update 8.1 boosted it a bit? Although, it seems to have performed above average (inline with Dracula) in update 8.0.