The leak is definitely real. I don't know why people keep denying it.
As for when the other stuff from the leak will be revealed? My guess is:
July 2019-Endorsement, Bede, Skwovet and Greedunt chipmunk Pokemon, Kabu Gym Leader,Camping
August 2019-Team Yell, Marnie, Gigantamaxing, Regional Evolutions, Blue Seagull Pokemon
September 2019-Opal Fairy Type Gym Leader, first evolution for starters
October 2019-Eternatus, Final Evolution for starters (Intelleon,Raboot, Giant Gorilla)
Plus lots more but this is what I am feeling will be revealed basing off past reveals for games.