Actually, it was Rick Berman that made the initial announcement that there was going to be a fifth Star Trek series. Up until then there was just a lot of speculation
by fans that there was going to be a fifth Trek series based on an idea that VOY would end after seven seasons and another series would immediately replace it. But no one actually knew what Series V would be about--or even its name--until only a few months
before its premiere as it was a closely guarded secret by the studio.