Telegram v3.10 (they apparently weren't ready for 3.2) just dropped, and with it come a handful of new features. The headliner is message drafting - messages you don't finish simply will linger in your chats list with the red text "Draft" appearing above what you have typed so far. Drafts automatically go to the top of your conversation list, which actually does make sense, since looking at but not sending a message does mean you'd still consider that conversation the most recent one you've interacted with. Full changelog follows.
DRAFTS AND MORE
- Introducing Drafts: Seamless syncing for unsent messages on all your devices.