WhatsApp Web has been updated to include a few new features that allow you to have more control over your chats and group conversations that take place in a Web browser. There are a few more options you can select in the browser version, like editing your profile photo and status message, and a few small UI tweaks.
The settings icon now also provides access to options like deleting and archiving on-going chats. The same options are available in the left conversation list when you hover over them or right-click them. When you are viewing group info, you can also add participants, change the group icon and also change the subject. There are keyboard shortcuts for some functions, but these are not stable yet.