Let’s not forget that Hamilton has also re-signed with Mercedes until the end of 2020
But that happened at least a day ago, old news!
I wonder how long they can leave the LeClerc/Kimi question. If they don't win this year's championship, I could see them keep Kimi inorder to retain the status quo between the drivers and give Vettel another chance of winning (I sadly don't see Kimi being the one to win again).
LeClerc has the ability to either cause the team to lose points compared to Kimi (which seems unlikely given his form so far), or put pressure on Vettel and unsettle him (just like Ricciardo did).
Edit: I see Kimi leaving if Ferrari don't renew. Maybe he'll turn up in sports cars or some ice racing series somewhere.