From logs and radio transmissions, there seems to be an end game so I do agree with holding off on it till the game is fully released. Save the "wow" and sense of wonder for later. If you dive in right now, you might get burnt out.
As a side note, this game is really pacifist. The only real weapon I see is the knife but its more of a tool than a weapon. At most it's for a last minute defense against the small to shark-sized creatures. There are torpedoes but they're not explosive, non-lethal and they're kind of limited to a sub you can get later in the game.Again, they're more defensive than anything.
Edit: And judging by the road map, by December the 1.0 should be done by then.