EDIT: For anyone doubting the validity of a YouTube channel, Ellie Littlechild and Seán Ferrick are people that attend Trek events. I met Seán at STLV last year. On top of this they have interviewed Mulgrew. While this news is unconfirmed as Ellie stated, Seán relayed this information second hand from Star Trek: The Cruise, which featured the cast of Voyager for its 30th anniversary.
It isn’t exclusively a series centered on Janeway. This series would be presumably similar to Picard in that notion.