The internet is probably the single largest factor in all of this as far as the market for such drugs growing. Many drugs besides MDMA are banned (both individually and through the Federal Analogue Act) and any drug that gains sufficient popularity and availability will likely be banned eventually. People probably say they are new because they are referring to their availability or are simply unfamiliar with their history.
This really isn't appropriate for the OD forum... to find out why, check out the OD guidelines and standards links in my signature. I'd also suggest you look into the 'drug culture' forum.