Haven't summoned for June yet, but I figured I'll get this out of the way now. With eight L/M heroes this month, the predictions are getting much easier to make.
LEGENDARIES/MYTHICS: The following are confirmed based on the notifications:
Legendary Marth
Fjorm
Legendary Azura
Legendary Hector
Legendary Lyn
Eir
Legendary Alm
New Mythic Hero (unknown color and type)
SEASONAL