2019 will be the last year that MLB teams can invite their entire 40-man roster when September 1st rolls around. In the new CBA that goes into effect in 2020, the active roster will increase from 25 to 26 for the full year and can increase up to, but no more than, 28 in September. While I don’t expect for the Braves to go crazy with roster call-ups in September, Anthopoulos did state that there will be a few immediate call-ups on September 1, but not a lot as Gwinnett will also be in the playoff hunt. Once that plays out, there could be a few more, but I still wouldn’t expect more than 2-3 extra additions
The statement above should come with an asterisk because there are so many guys that will definitely be up when rosters expand if they are healthy.