Disney doesn't need to hype these new projects at this year's D23. A simple announcement with "more details to come in the future" is plenty. You're overestimating how much the "average Joe" cares D23. The average guest rarely knows what's going on at WDW until a new attraction or land is almost ready to open. Yes, I'd love for them to release full details, but it probably won't happen.
I kind of hate that so many discussions devolve into the same old "Uni vs. Disney" debate, but as for your claim that Universal will have "constructed 6-8 E-tickets" in that span...
Until Kong debuts, IOA has received exactly one new e-ticket attraction in the 16 years since it opened.
In the last 10+ years (January 1, 2005 until today), here's a list of every brand new E-ticket attraction that Universal Orlando Resort has built in both parks:
Gringotts
Forbidden Journey
Transformers
Hollywood Rip, Ride, Rockit (for my money a relatively unremarkable coaster, but I'll give it to them as a "thrill ride")
Also noteworthy are Despicable Me and the Simpsons Ride, but they are both essentially a new film experience and re-brand of 25-year-old ride systems and theaters, so I'm therefore reluctant to crown them "new" E-tickets, but I'm open to arguments for both of those. But if you include either of them, then I'd include Star Tours 2.0 as a new E-ticket as well, as it was an even more drastic upgrade of a ride going from 2D to 3D and is a better ride than both of those.
So that's 4 brand new E-tickets for UOR in 10 years, spanning both parks. And if Disney built Rip Ride Rockit they'd be crucified for building a non-themed roller coaster that's out in the open with pavement beneath it. The quality of the other three (FJ, Gringotts, Transformers) is undeniable, even if those 3 e-tickets aren't necessarily everyone's cup of tea.
Hogwarts Express is slightly noteworthy, but it's a train with a video and special effects, not an E-ticket.
Beyond that, I don't think I've missed anything (e-ticket wise), but it's certainly possible.
So what you're suggesting is that somehow Universal is going to open 6 to 8 more e-tickets in the next 6 years, when in the previous 10 they opened 4 (maybe 5 if you really fudge it)? Where do they plan on putting them?
Now, don't get me wrong, I'm not suggesting Disney was active over the last decade in comparison. They clearly weren't, but in that same 10 year time frame, WDW has opened Star Tours 2, Fantasyland Expansion (Little Mermaid, Seven Dwarfs), Expedition Everest, Soarin, and Toy Story Mania. Not sure how many are "true" e-tickets, but either way, Universal "won" the last decade if you were to insist on making that comparison. But people seem to love exaggerating what Universal is doing in terms of "RIDES RIDES RIDES RIDES". They have built a couple of excellent, well-themed lands (Harry Potter 1 and 2), but those two lands are relatively small and only consist of a total of 3 new attractions across those 2 lands (Forbidden J, Hogwarts Exp, Gringotts, while losing Jaws and a portion of the Lost Continent). And they've done a good job of "resort" expansion with hotels and citywalk, if you want to include that as noteworthy (I don't, but whatever floats your boat). And it looks like they'll finally have a water park to compete with Blizzard Beach and Typhoon Lagoon (and admittedly, one that seems like it's on track to best them, but I'm not a big water park guy. Nonetheless, I'll give them props for it if it turns out to be as great as its ambitious concepts appear to show).
But again, my point is that everyone keeps clamoring about the E-ticket producing machine that is Universal. It's an exaggeration. And they're certainly not going to "out-build" Disney over the next 6-7 years. Avatar, and (if all the rumors pan out) the huge DHS expansion, the 300+M going to each of MK and Epcot, and a potential separate expansion/E-ticket for MK.