cgnnews has just uploaded a video recently, which is actually a review I believe, but as I can't understand Thai I just watched a bit of the gameplay instead.
The video itself is over 30minutes long and shows gameplay pretty much throughout.
It's weird though, as my preconception of the game was that it would be some kind of scrolling beat'em up type game, but it looks more in line with games like maybe Starcraft type games.
If you look at the KOF Online official site it does seem you are able to download it now, though I gave up halfway through trying to figure out to register. (May try again when I'm less tired from work.)