That's a little bit crazy. Version 3.7 of the messenger Telegram was just published for Android and iOS with some updates regarding group limits and group management.
The new features are:
- Supergroup-limit now at 5000 members
- Pinned messages in supergroups
- Public groups (with @username)
- Better moderation tools for group owners
- Convert any group to a supergroup with advanced features
Sorry for the iOS screenshots, but that are the only official ones: