i got both of the films ages ago (im in the uk) i happened to see the 2nd film first and then the first film, i have to be honest and say that the first film kicks the crap out of the 2nd, i do know that the director of the first film died just as he started working on the 2nd so his son directed it insted.
im also sure what a company in the USA did i kind of remake but im not sure, it had that stone cold wrestler guy in it, i heard it was shit. i dont think it would be remade in the US coz its about students killing each other which might be a bit risky for a company to do over there