This update brings another bunch of improvements to the Half-Life campaigns. We have added most of the remaining Half-Life: Source entities, including all of the weapons.
We have also fixed a few issues with Half-Life campaign visuals and audio, such as some Half-Life: Source maps missing their music and ambient sounds, as well as some props not receiving light from player flashlights and the Lamp tool.
Half-Life 2: Episode 2 maps also have visual fixes - detail sprites which are used by the tall grass on many open maps are also fixed. This fix also affects any custom maps that use detail sprites from that game.
We have also added a Borderless Window option to the Video settings, so you no longer have to mess with Launch Options in Steam to get this functionality.
Steam Rich Presence support was added in this update, so now you can see what your friends are playing.
And finally the update contains some nice changes to the Hammer Editor as well as the map and model compilation tools, such as increased limits and new features for the Hammer Editor, which gives content creators more freedom when making maps and models.
You can find full and detailed changelog of what was changed and what new stuff was added below.