Not likely hype; The company has been operating independently of operation Warp Speed. Except in alt-reality, of course. I was wrong, by the way, when I predicted that Trump would claim he has a vaccine in the week(s) leading up to the election. I think he managed to shift focus away from covid way better than I anticipated. Looking at new case numbers, we're in big trouble. Sadly, it's the "flyover" states, with so many Trumpkins, that are getting hit hardest right now. And Don Jr.'s right, the death rates (likelihood of death per covid case) are down significantly, because we've really upped our game with therapeutics, but that's not some sort of justification for the administration's criminally (imho) poor covid response.
If it's true that the effectiveness rate is indeed 90% then probably they should stop the trial early and apply for authorization (this happens from time-to-time in medicine, although it's pretty rare, on the theory that it's unethical to continue to withhold a lifesaving treatment from the public)). However, what I mean by hype is that we have no idea about the details as far as strength of antibodies over time, potential side effects, subgroup analyses of different age and comorbid conditions (which I'm sure they powered for). These things are really important to understanding the full picture, and I don't think it's possible to get those details until the trial is complete. I'm very optimistic, as the stock market clearly is too, but we can't stop looking with a skeptical eye by the same token.