Slitherine

Thinking of picking up two copies. One for my brother...Trying to get him into wargaming. But have a question about the pending upgrade that will be happening to Unity. Will what I buy now be able to upgrade to the Unity version via expansion or will I need to completely rebuy the base game?

Thanks

Did a quick search of the forums and as I read it previous owners will get the Unity upgrade. So unless I'm completely wrong it looks like if I buy it now I'm safe for the switch the Unity.