As of today, you will have the ability to use WhatsApp on your web browser. WhatsApp announced a web client which is essentially an extension of your phone: the web browser mirrors conversations and messages from your mobile device — this means all of your messages still live on your phone (BlackBerry Blend anyone?):
To connect your web browser to your WhatsApp client, simply open https://web.whatsapp.com in your Google Chrome browser. You will see a QR code — scan the code inside of WhatsApp, and you’re ready to go. You have now paired WhatsApp on your phone with the WhatsApp web client. Your phone needs to stay connected to the internet for our web client to work, and please make sure to install the latest version of WhatsApp on your phone. Unfortunately for now, we will not be able to provide web client to our iOS users due to Apple platform limitations.
How to pair WhatsApp with Google Chrome:
BlackBerry OS: Open WhatsApp -> Chats -> Menu key -> WhatsApp Web
BlackBerry 10: Open WhatsApp -> Swipe from the top -> WhatsApp Web
** Seems like the option is being slowly pushed. Hence why you most likely won’t find it at the moment when swiping down. Just be patient. It’ll show up in a few hours **