I'll definitely buy it.
The arcade original was, in my opinion, a masterpiece for many years (it was way ahead of its time). I also really liked KI2 (especially KI Gold on the N64). I've had only two occasions to play the new one on my cousin's XOne and I was very pleasantly surprised. I watched many game-play videos prior to that of course on YouTube, but I never really was able to properly "judge" it since I wanted to give it a try. Well I have (although not for long each times) and from the little I've played I had a blast. I still, however, really dislike what they've done with Glacius, both designs-wise and for his fighting style. And I'm not exactly "happy" with the new Riptor (the original one felt way more heavier, massive and intimidating). But other than for those two I actually do honestly like (and love in some cases) the other new takes on the rest of the characters. I especially like the new Fulgore (when in fact it was KI2's Fulfore that I sort of disliked).
Yeah I'm in. I'm happy that the PC is getting more fighting games since a few years with Street Fighter IV, Mortal Kombat 9 (2011), Injustice, Mortal Kombat X, Street Fighter V, and now Killer Instinct. To me, it's only good news.
i'm probably the biggest killer instinct fan on this forum. i own a killer instinct 2 arcade cabinet (with PCB+HD) and a killer instinct 1 PCB+HD. it's in my garage and i still use it every now and then. i have to say though, KI1 has NOT aged well. but for nostalgia reasons i still love it.
i've had KI on xbox1 since launch, and i have to say, i am IN LOVE with the game. i was playing it literally every weekend since launch of x1 until my son was born in march, and i haven't had much time with it since, which sucks.
as far as glacius, i was also not a fan of his redesign. at all. i played him at evo (before the game was out) and was like WTF is this crap? but after the game out, i gave him more time and really started to like him. now he is my main and my best character. also, i ALWAYS play with his retro costume, which IMO, is the best retro costume in the game. it really looks like the KI1 version, other than not being quite as bulky. no pointy spikes or anything.
also you didn't mention anything about online play on KI with your time on it, but let me tell you, it is BY FAR the best online experience i've ever had. it literally feels like you are playing with someone in the same room as you, yet they are thousands of miles away. it's incredible and i truly have no clue how they can make it so great.
with sf5 coming out, and them claiming to be wokring on their own version of rollback code (like KI did), i only hope it is as good as killer instincts. it is a tough feat to match. i was extremely let down with how piss poor the netcode in MKX is though. it's terrible. worse than SF4, which is playable, but after playing KI, it's hard to go back and play SF4 now.