Until the UPP servers are updated, I've linked in a temporary download to the page above so you can grab it now.
Good question. My understanding is the faster servers will be more heavily used. If ROOL also provide a server (seed), it's not going to be any worse than everyone downloading from them directly (well, a bit of overhead). It has the potential to be significantly better for ROOL, especially at big release times (when lots are downloading at once). However if people can be convinced to run BT servers all the time, particularly those on 'unlimited' bandwidth packages, then that'd reduce the load on ROOL. You might end up getting 80% from ROOL (because they're so much faster), but it's still a 20% saving on their bandwidth bill. And there's nothing stopping people with colo boxes running BitTorrent there too