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I've been told the title for Avengers 4 is Avengers: Endgame.
I was given the information last Saturday, which you can read more about on my site Cosmic Book News .
I was also told a confirmation just today.
I think the title fits with what has been said to be a spoiler, for obvious reasons, but it doesn't come off as too spoilerish.
If you have seen Infinity War, you also know the title was named by a certain character.
We've also posted our Avengers: Infinity War review, and I recommend going to see the movie if you haven't already--multiple times!
Thanks!
-Matt
Further reading:
https://www.cosmicbooknews.com/avengers-4-endgame