At todays Microsoft E3 2019 press conference, Microsoft announced that Gears 5 will be out officially on September 10, which is what rumors have pointed to before. In addition to that, The Coalition took to the stage to announce a few things: a tech test will be happening this July as well.
Source: N4G PC Gears 5 Release Date Announced; Can Play It 4 Days Early via the Ultimate Edition, New Trailer