Mission Possible: Telegram app now offers disappearing messages in Private Chats
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Telegram now allows you to set a timer that will make videos and photos disappear with Private Chats
Also, you can now add a bio to your Telegram profile. And stickers will be easier to use thanks to a new feature that allows you to enlarge the scrolling area. This makes it quicker to find the right sticker to go along with your message. And with version 4.2, Telegram users in countries like South America, Turkey, Indonesia, India, Iran and Iraq will see download times shorten thanks to CDN caching. This allows the app to cache publicly available videos and photos posted in massive channels (with 100,000 or more members).
Lastly, Telegram has added new video editing tools that make your images look great. If you have Telegram installed on your mobile device, keep your eyes peeled for the update.
source: Telegram via Engadget
Things that are NOT allowed: