It's a bit contrary for me to be confident. He never says yes or no to more campaign. "we've got a lot more stories to tell about the Endeavor and LV-895" kind of makes me think more campaigns, but then the answer to you asking when we'll be seeing more campaign or more Horde maps, you're told "The roadmap gives a bit of a look into that - Season 2 and 4 will have new Game Modes, which if you enjoyed Horde Mode, you'll like these, with some twists on the strategies, length, and location."
I guess what I'm saying is "more stories to tell" could be found in the new Game Modes. And we know new features doesn't mean new maps or campaigns now.
I guess we'll see!