I have to say "hell no" on the choices for a recast of Gracie Law and Miao Yin. Plus, I hope that if they did do this, they'll get the original cast involved (and even have Carpenter involved as well). But then again, I don't know about the site that you linked, so I can't be sure if its true info or if it's not.
I heard about this a couple of days ago and had to check here. If this is true (and I am a huge BTLC fan) that case looks amazing! I can't remember being so nervious about a prequal since the second Starwars prequels, Prometheus, the next Prometheus, Winter soldier, Hellboy II, oh, never mind...:lol
Jack is not some hulking dude. He was a cocky truck driver with no skill other than some good reflexes with catching a bottle coming for his face and a lucky knife throw. He was for all intents and purposes the side kick, not the star. He just doesn't fit the role of Jack Burton.