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Yes, and I know it's not 'your' edition of the Knights. The 'Black Falcons' (although we never called them that) came out in the 80s.
I rather doubt that they'd still do a castle base like those old ones, sadly. They've generally moved away from the customised base plates that you used to get with most themes, including those for the castles. I did like old-style base plates, my favourites obviously being the space versions with moon craters, but they did have their drawbacks, and LEGO now seems to be angling for the different approach that we've just seen in the new City 'road plates', i.e. probably thicker and more solid, not so easily punctured.
@Soul:
https://www.promobricks.de/lego-creator-3in1-sommer-2021-neuheiten/121871/
It doesn't say whether this is a 90th birthday celebration set, but why else would they do one like this following that poll? Not many minifigures--obviously, what everybody wants there are massable knights, so that's probably a miss (but wouldn't be possible without a number of smaller sets to accompany it). Also somewhat disappointing that they've made it a Creator set instead of reviving LEGOLAND (or at least starting a Medieval line). I do like the different designs at first glance, though.
Considering that there isn't official 90th birthday branding on this, maybe there will be more sets based on what came high up in the poll, and this is a consolation prize? IIRC all the knights lines together attracted more votes than anything else. Of course, it's entirely possible that this is what they've picked and there won't be any others.