Demo is out for the Steam Game Festival from Jun 16-22. The map is still work-in-progress, but it should be enough to get a feel for how the mechanics work - flying, swinging, etc. For now, multiplayer is only up for US/Europe (and Europe only certain times, check Discord below). If a server is not up in your location, you're welcome to try and join the US one, but do so at your own risk and likely heavy lag (just physical limitation of how fast data can go across the world). Single-player mode is always available though if you just want to get the feel of flying.
There's a Discord channel for voice-chat in game as a temporary solution until in-game chat is done. We'll also post updates (such as server availability) there and answer questions. Those without VR can watch players on Twitch or join the game to watch in spectator mode.
Links to everything (Discord, Twitch, etc) can be found at
https://www.vrjetpackgame.com/