I saw the announcement earlier today, but have been busy cramming end-of-year schoolwork for the day and only finished recently.
My thoughts? Well, first off, they certainly chose to announce it at an interesting time, when lots of grand strategy fanatics (including myself) are no-lifing Stellaris (and with Hearts of Iron 4 on the horizon as well). As for the few details we know of the game itself, the graphics are certainly a step backward in my opinion, and though not necessarily a dealbreaker for me, it doesn't bode entirely well. Cities expanding to cover multiple tiles is cool (and makes sense), and should make playing tall (assuming that's still a thing in Civ6) very satisfying. Those are pretty much the two defining details we know of as of yet, the rest is trailer-speak "INNOVATION, NEVER SEEN BEFORE" stuff.
As bane_ mentioned, no mention of moddability is concerning, but this is only the initial press release, so I assume we'll hear more in the weeks/months to come. And though I'm not as gung-ho about modding as I was when I first started learning a few months ago, I think it's a lot easier to appreciate a game whose core construction supports modding quite well (Paradox games are really good for this, Civ5... not so much). We can only hope.