You will soon be able to make audio and video calls on WhatsApp directly from your PC. According to WABetaInfo, a site specializing in messaging news and generally very well informed, WhatsApp developers are working on integrating audio and video calls into the web version of WhatsApp.
Calls received will be made in a remote window, separate from the rest of the messaging system. Likewise, when a call is initiated from WhatsApp Web, a thumbnail window will open next to the main window. WhatsApp Web should also support group audio and video calls.
Currently still under development, this new function could land in the coming weeks for all users.