Um, secret chats have been there for a long time.
This often leads to people saying things like "Telegram doesn't have end-to-end encryption". Really, what they mean is that it's not the default and isn't on all platforms. Most people can use it if they want to though because it's available on all major mobile OSes.
I use the Telegram app on my OSX Laptop, and i use Secret chats. They seem identical to my Android secret chats. What am i missing?
[1]: https://github.com/telegramdesktop/tdesktop [2]: https://github.com/overtake/telegram