So my understanding...
NOBODY is GUARANTEED to get a phone at all via the BB pre-order. HOWEVER, with that said, if you pre-ordered in the first round, you WILL get it even though they're not guaranteeing it. If you ordered in the second go-round, then you MIGHT get it. The first go-round was them trying to pre-sell all of the phones they expected to be getting in. Since that pre-order went so well, they tried to increase the number that they'd be getting in with no guarantees on how many extras they get in. With that said, they are getting some extras in, so they're opening pre-orders on an even less-guaranteed basis this second go-round.
Again, NOBODY is GUARANTEED anything but unless they sold more than they were supposed to the first time around (and yes, some of the stores screwed up on that, I'm sure - hence the non-guarantee), you will get it. If you pre-order the second time, you might get it.