Old Testament People

The Old Testament people thought they had heard it all.  They felt in possession of a fullness of what God has to say.  Then along came Jesus.  He came saying some old things and some new.  He had new revelations, and came being God's son.  Is this the end, or is there maybe a newer revelation, yet to come?  Are we thinking the fullness has arrived, that we possess it?  Maybe a time is coming when we will be the Old Testament people giving way to something more?