Okay, I'm going to clarify some of what I know as explicitly as I can without naming names. I'm not going to do a list of houses because, unless I'm being lied to, it's not rumor for me. I have enough info and details on most of them to where almost everything I know is "confirmed."
First, as it stands, only one house may be changing from what Universal had planned in January. Nothing has changed because of release dates. If (big IF) a change happens, it'll be minimal like Scream into Purge. Characters will change. Some scenic treatments within the house may change. But nothing is becoming a whole new house. That's not how Universal works. And while I have a couple ideas of what it can turn into, I don't know what they're going to do yet. That's the one house detail I don't know.
Second, prior to the "leak" about what icon was coming, none of my sources had told me an icon. None. And I asked. Now, after an icon was listed, it's all I hear about. But because there's so much noise around it that started after it was "leaked" I can't tell what's echo chamber and what isn't. I can say, none of the originals I'm tracking match up with the rumored icon. My gut says there isn't an icon at all this year, but my gut's been wrong before.
I know nothing about the Streets yet, aside from they're getting built. And where they'll be located, but no surprises there.
Hot damn, ya'll are in for a treat on the new original houses.
Stuff can still happen. I can still be way off, and maybe my vagaries are where so much of this confusion is coming from. But I'm still seeing so much declarative stuff out there and it's just June.
Keep speculating. The only thing that should stop discussion is the official announcement.