And yes, it is now more restrictive than before. In fact it seems RCI has followed along with NCL's new policy - you have 48 hours after making a deposited booking to find a lower price that has many restrictions. The old policy allowed changes as late as 3 days before the cruise.
According to what I can glean, once the 48 hours has past, you are locked into whatever price you booked - even if it decreases later on. I need to get more verification though.