Fallout 5 - Coming after Elder Scrolls 6

Todd Howard confirmed in an IGN Interview that Fallout 5 is coming after Elder Scrolls 6:

Yes, Elder Scrolls 6 is in pre-production and, you know, we're going to be doing Fallout 5 after that, so our slate's pretty full going forward for a while. We have some other projects that we look at from time to time as well.

Thanks MAHak!