Which seems like a stretch. As the two
Dragon Heist products are coming out in September (which is arguably more Autumn than Summer) and November (which is Winter). It really seems like there's two additional settings coming.
The article does quote Stewart as saying
"Next month we're going to talk about a couple of different settings that people can start playing as early as this year,"
And also:
"We have two surprises that I think hardcore D&D fans are really going to love coming this summer," Stewart said. "And then I think we got one surprise that's going to release later this year that we've not told anyone about. We're going to announce it in July."
Which would make ZERO sense if he were talking about
Dragon Heist. Not just because—as mentioned—those are not coming this summer. But because those had already been announced (and thus were not surprises), and are hardly limited to hardcore fans.
Now, admittedly, the second line could be an awkwardly worded statement that the surprises were coming in the summer, and not the products. But it seems weird to phrase things like that
at the Stream of Many Eyes. Why "We have two surprises coming this summer" rather than "we have two surprises coming in like 45 minutes"? That's possible. But strange.
Plus, if it were misleading people, if it were bad phrasing from the author, wouldn't they have edited or updated the article rather than make a vague comment on reddit?
I'm keeping my expectations low, and not expecting a December hardcover that updates two or three settings but is mostly adventures. That'd be an odd product...