It can be quite difficult to locate Wandering Traders sometimes. They are just sneaky fellows. To counter that Wandering Traders announce their presence with Nice Villagers Remastered. They send a neat and random Message to players within a 64 block radius when they spawn. They also shoot some fireworks and glow for a short period of time after they've spawned to communicate btter where they are exactly. Every Wandering Trader also has a random name assigned to it.
Trades of Wandering Traders have been expanded to alsways include 3 mobheads (with noteblock sounds) as well as a 25% chance of also having a random enchanted treasure book. This should make it a bit more rewarding for players to look out for a Wandering Trader.
But be careful! - Wandering Traders have a small chance to spawn as a disguised Illusioner. It reveals it's true identity when interacting with it. If you look closely you can spot them out since they give of some stinky, blue particles.