The groupo is a weird setup. You get the older hubs, but the newer cranks. Strange. But yeah, it's probably english threaded, that's definitely the norm.

As for the seals on the Miche BB, they're not bad. They're more of a "throw away" BB, anyway. not that expensive, no maintence.

my favorite thing about them is the "fixed cup" isn't fixed at all, there's no lip. this means you can move the whole BB to the left or right of center to achieve a perfect chainline, it's a huge advantage. don't get crazy, though. you don't want many exposed threads. Also, make sure that you're tightening it to spec, since there's no fixed cup, it can be a little tricky. I flew through installation the first time and a week later ended up with a loose BB at an alleycat, not a fun situation.

Miche = good stuff.