WhatsApp has always tried to stay ahead of the curve in a lot of ways, but, with an impressively busy beta release schedule, it is often hard to keep track of every novelty and how it found its place inside the app. The following batch of features can be found in version 2.12.535 of the app and appear to be new. WhatsApp now supports a bit of text formatting. Just like in Google+, if you surround something with asterisks, it becomes bold and using underscores, produces italics. Sadly, that's about it and even dashes don't produce the expected strike-through effect. However, it...
Source: http://www.gsmarena.com/whatsapp_now_offers_text_formatting_options_and_can_send_google_drive_documents_as_pdf-news-17279.php