Honestly, I don't see this as having been implemented.
It is the Phasing element that deals in time and so therefore this is where future should be shown.
When I show a client what we are proposing to supply now and what we will supply in the future, these are two separate orders and so happen at two different points in time.
This could be handled as per the following:
The client may decide not to go ahead with the future order and so the whole phase can be removed.
Or
The client may decide to go ahead with the future order and so a new drawing can be created at that point in time showing what was previously implemented as existing and the future becomes new.
Or
The client decides to include the future with the current works and so therefore the new and future phases can be merged.