Jon Heyman of MLB Network reports that early July "remains MLB’s target for a season."
Heyman says that spring training 2.0 "would likely be three weeks," plus an additional two weeks for those who wish to report early. With a minor league season looking unlikely, rosters "are expected to be expanded" and may also include a taxi squad. While optimism that there will be a 2020 season starting up at some point seems to be increasing, this is all still very much up in the air at this point. MLB is still evaluating a number of different scenarios and has to get the MLBPA to sign on, as well.