that's the first i've heard about three 6 shooting their videos in miami, but it doesn't surprise me.. memphis heads are always down on three 6 since they've ripped off so many of the other memphis cats they've worked with over the years. people say they don't have respect for memphis/its artists/whatever. i don't know how much of that is true, but it's what a lot of people say.
as far as sampling, three 6 can keep doing whatever they want as far as i'm concerned.. the new soul sound is nice, though i do like the early, gritty, horror-movie-sampling tracks a bit more.