Where are you getting this information? This happened almost a month ago. It was probably partially the reason this entire thread was originally started. Google search it if you don't believe me.
I don't doubt that you may have got this information recently because I saw people repeatedly spamming the Poloniex board with this last night (& subsequently getting banned). I just don't understand why unless someone was making a mass effort to pump XRP.
Never went to bitstamp but the first two pairs were USD for xrp and euro for xrp. The new pair according to the update is trading using bitcoin for xrp.
again I'm not sure if that was always the case but that is what the article from Ripple or bitstamp is sayin is new as of yesterday.