Box when ? also buff trial reward at higher rating?

is the mystery box coming soon ?

also after looking at the reddit post for Trial reward at 400+ rating gettin only 7 jewelers for a 25minute fight dont make any sense?

will there be any buff to league mechanic to make it worth doing over map?

25min league mechanic ( 7jeweler reward) 400+ rating
1 normal map give you way more in 5min or less....

so why do the league mechanic?