Everything you just said is planned. We are going to record a tutorial / intro video but I don't have the time and the game isn't solid enough for it yet. You can build infantry via the barracks, only a rifleman and driver though. In the far future, we plan on adding aircraft and ships as well.
There's other features buried in there that aren't immediately obvious. Like all vehicles having a driver that can get out, individual character portraits and names, infantry boarding into apcs, etc., Multiplayer via LAN technically works too.
It'll be much better in version 0.02, although but it'll be a few more versions than that before it's worthy of getting put into Early Access on Steam.