Trees are back on the 2006 maps in the 64-bit client, and they sway in the wind just like in the old client.
New in Video settings: HD textures. Tick it next to the 2006 options and restart the game for sharper textures on the world, towns, monsters, NPCs, weapons, effects and the 2006 look. It is off by default.
For Back Stab, idle monsters now keep facing the direction they last walked. In the 2006 look, the School Shirt keeps its colours.
This update is big, about 4 GB, because it includes the HD textures. Start the launcher to get the update. If your launcher was already open, close it and start it again.