ESPN article has more details...
https://www.espn.com/mlb/story/_/id/29004498/mlb-union-focused-plan-allow-season-start-early-arizonaNot just Chase stadium, but Chase + 10 spring training facilities.
Implementing an electronic strike zone to allow the plate umpire to maintain sufficient distance from the catcher and batter
• No mound visits from the catcher or pitching coach
• Seven-inning doubleheaders, which with an earlier-than-expected start date could allow baseball to come closer to a full 162-game season
• Regular use of on-field microphones by players, as an added bonus for TV viewers
• Sitting in the empty stands 6 feet apart -- the recommended social-distancing space -- instead of in a dugout