Meh, producers blow their wad on impressive premieres all the time, but television's a marathon, not a sprint and the hype on display for two hours of content only makes me wary of a Walking Dead-style bait and switch around the corner (budget slashing, narrative directionlessness, revolving door casting, paper thin character development, etc). With how much CBS has riding on this show and how desperately a lot of us want something even remotely like the Star Trek we grew up with, it's conceivable that there's a good degree of overstatement in effect out of the gate, probably somewhat in overcompensation of the misgivings a lot of us had about it throughout its production (which probably suffered a degree of exaggeration as well). I'll wait to see how it fares in the meat of the season though, and how it finishes, before I'm convinced Star Trek is truly alive and well again.
That said, even if all we do get out of it is a couple hours of really well done "official" Trek, that'd be better than what anyone else has done in 15-20 years. If the premiere is as even half as good as these tweets indicate then that'll warrant at least a tip of the hat, even if they can't follow through on the promise over the course of 15 episodes (let alone multiple seasons).