Cool video. IMO, they use this sentence because they can't show anything yet, and have to describe the amount without telling the exact amount. It is hard for them to tell exactly what you will get in the expansion (how many exotics, strikes and so on) because they are working on it. They are showing new weapons in tomorrow's weekly update. (from what I've heard) Let's wait and see. I bet everything will be more clear in 1-2 months before the release of the expansion. Don't worry.