Yes it is and it will never change in being Centralized, I doubt about it at the very first time that I knew it was centralized because the essence of most of the crypto currency is to be decentralized and not being controlled by any, most of all regulations from authorities but here comes the Ripple.

Theymos already made a thread about his idea with different cryptos besides Bitcoin here: https://bitcointalk.org/index.php?topic=2095328.0 and he qouted Ripple to be '100% centralized'