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I also would like to know that. it is the only real end-to-end encrypted whatsapp alternative. I hope it stays that way.

you shouldnt trust closed source software also there are numerous complaints about their security model. See http://www.cryptofails.com/post/70546720222/telegrams-crypta... for example. Why not use an open source, cross device alternative? https://www.surespot.me/

Telegram clients (ios,andriod,windows,osx,linux) are open source. Server is closed but client code and protocol provides user with verified secrecy.

anyway i dont work for them and Surespot also looks nice. though nodejs+coffeescript at the server worries me a bit.

I think I mixed up Telegram and Threema so my bad and thanks for the correction/reply.