the apple comparison doesn't work that well when we talk about consumer choice imo. main reason being apple won't offer sd expansion as a choice on their devices. but the majority of apple users are like android users...they use the largerst portion of their storage for media, not apps. if apple users had the choice to buy 16gb models with its lower price along with sd expansion i can guarantee you the 16gb would be their sales leader. but offering that would go against their model and eat into their margin.
i still believe samsung will offer the choice of larger storage sizes, just not right now. they're holding it up their sleeve for a reason, although i'm not sure what that reason is. i doubt its due to them rushing the phone to market as the storage size would have no impact on the device that i can think of. also not like there's a shortage of 32gb memory.