Neither. They're not getting rid of Hexproof because it's so useful for combat tricks like
Dive Down and
Ranger's Guile. They're just adding Ward as a means to print creatures that are harder to remove with target removal without being impossible like with Hexproof.
I'm not sure we'll see new Shroud cards ever again, but that's only because Hexproof replaced Shroud. The last time they printed a new card with Shroud was in 2011 with
Neurok Commando. A couple months later in Magic 2012 (or the original Commander decks if you want to count
Champion's Helm), they introduced Hexproof.
So no, we haven't seen the last of Hexproof because it is so useful. It just doesn't play as well as taxing effects like Ward on permanents. As for Shroud, we might see some more cards with that mechanic in Commander or Horizons products, but there probably isn't a reason for it as Hexproof does the same job better.