SamSho's gameplay looks very much like 1 or 2 to me so far. Which I don't mind one bit, but I'm not sure given there was 3 through 5 in more recent history, plus characters from there. Was happy to see the L/M/H/K layout, though. Nice, simple, to the point. The high-damage special where you lose your Rage gauge seems interesting. Not entirely sure how I feel about that but at least screwing it up means you're at a horrible disadvantage is good. I might look to see if there are other conditions (like health), but... meh... I'm not going to pay that much attention
I really would've liked to have seen more of Charlotte's gameplay since she was my main, but this'll do for now. I don't quite get her costume change. Its not like major fanservice or anything, but it seems... silly? Meh. I'm going to assume there'll be DLC costumes, so if there's an old school one I'd buy it.
Genan should be a must, but whether he's available or launch or DLC is the question. I don't think there's a definitive roster yet? Judging by KOF XIV, SNK has something resembling a support plan for games now (about damn time), so I'm hoping Tam Tam and Cham Cham make the cut eventually. What'd be REALLY awesome but not likely is having crossover characters from Last Blade or even Bishomon from Darkstalkres/Vampire.