According to my calculations we have just 4 kingdoms left at only 8 troops: Adana, Darkstone, Glacial Peaks, Leonis. I would expect to see the next few events add to those bringing them to 10 or 11. So by October all kingdoms will be 9+ (with just 9 kingdoms at only 9), will we see a 6th power level added? 5 requires 2600 points (8 troops at 325 each), so I’d expect a 6th level at either 2925 points (9 troops maxed) or 3250 (10 troops maxed).
Any conjecture on a worthy 6th level? Maybe raising tribute from 20% to 25%? Maybe unlock a stronger banner?