They have announced a roadmap. http://joinsquad.com/roadmap/ The next update will be Alpha 16 and the intended new feature for that will be helicopters and a new map. Beta 1 will appear after that containing the commander role but most focus will be on optimization Eventually we will see release version 1 which should come with some new factions. I feel like there might be some more releases between the ones they mentioned but maybe not.
We have a new roadmap and lots of fun things on it. Release dates might always change. 100 player testing is scheduled to start end of July. End of August will see a new map, Fallujah. There will also be a new faction, Middle Eastern Alliance (MEA). The Australian forces is set for the end of October. USMC is scheduled for December. During 2021 we will see the new Panasia faction. There are ofcourse more weapons, vehicles, maps, game changes and additons on the roadmap but these are the big things. https://joinsquad.com/roadmap/