Parmandur
Book-Friend, he/him
And that ties back in with what I've said about the fairly extensive coverage of Hartsvale in SCAG - more coverage there than at any time since Denning's Giant trilogy was still new material! And you're right about other material tying into that; the whole backstory and history of the giants, as well as the ordning, as laid out in the MM is straight out of Denning's novels and the 2e FR accessory "Giantcraft" which was based off them...
The last line in the Hartsvale section in SCAG is intriguing: "If one or more giants decided to organize the ogres, I don't know if any in Hartsvale could stand against them." That definitely sounds like it might be planting the seeds of a future giants adventure...
Yeah, that all seems to point in a general direction they may be going. They put seeds about Demons in the MM that they did follow through in RoD, Elemental Evil as well. I think they can do a Giant themed AP, without it having to be a retread of Against the Giants; in fact, one of the designers said recently on Twitter that one can run Against the Giants pretty much as written in 5E, and they are actively selling the old adventure in PDF.